Pinned to release v0.5.9. For the current default branch, see VC Configuration Reference.

Configuration Reference

Generated: 2026-05-18

Complete reference for all configuration parameters in the VC system.

Table of Contents

• Environment Variables
• Common
• API Gateway (APIGW)
• Issuer
• Verifier
• Registry
• Secrets File Reference

Environment Variables

These environment variables control service behavior outside of the YAML configuration file.

Variable	Description	Example
VC_CONFIG_YAML	Path to the YAML configuration file. Each service reads this on startup.	config.yaml
SSL_CERT_FILE	Path to a CA certificate file that Go's crypto/x509 trusts for TLS verification. Required when services use self-signed or private CA certificates for inter-service HTTPS.	/pki/rootCA.crt

common (Top-level)

Shared configuration used across all services.

common

Path: .common

Field	Type	Description	Example	Default	Required
production	bool	Production mode	-	true	No
log	object	Logging configuration	-	-	No
mongo	object	MongoDB configuration	-	-	No
tracing	object	OpenTelemetry tracing configuration	-	-	No
kafka	object	Kafka message broker configuration	-	-	No
secret_file_path	string	Path to a separate YAML file containing secrets; when set, secret values in config.yaml are cleared and only non-empty fields from the secrets file are applied.	"/etc/vc/secrets.yaml"	-	No
ha	object	High-availability mode. When Enable is true, caches use MongoDB (Common.Mongo.URI) instead of in-memory storage so state is shared across instances.	-	-	No
branding	object	Custom branding configuration (logo and favicon paths)	-	-	No
credential_metadata	object	OAuth2 scope values to their credential configuration, required by apigw, issuer, and verifier Key: OAuth2 scope (e.g., "pid", "ehic", "diploma") - matches AuthorizationContext.Scope Each entry contains the VCTM reference, format, and other configuration for that credential type	-	-	No

log

Path: .common.log

Field	Type	Description	Example	Default	Required
folder_path	string	Path to the log folder	"/var/log/vc"	-	No

mongo

Path: .common.mongo

Field	Type	Description	Example	Default	Required
uri	string	MongoDB connection URI	"mongodb://user:password@mongo:27017/vc"	-	Yes
tls	bool	TLS for the MongoDB connection. Can also be enabled via the connection URI parameter "tls=true".	-	false	No
ca_file_path	string	Path to a PEM-encoded CA certificate used to verify the MongoDB server's certificate. When empty, the system root CAs are used.	-	-	No
cert_file_path	string	Path to a PEM-encoded client certificate for mutual TLS (mTLS). Must be set together with KeyFilePath.	-	-	No
key_file_path	string	Path to a PEM-encoded client private key for mutual TLS (mTLS). Must be set together with CertFilePath.	-	-	No

tracing

Path: .common.tracing

Field	Type	Description	Example	Default	Required
enable	bool	Enable activates OpenTelemetry tracing	-	false	No
addr	string	OTEL collector address	"jaeger:4318"	-	Yes (if enabled)
timeout	int64	Timeout in seconds	-	10	No

kafka

Path: .common.kafka

Field	Type	Description	Example	Default	Required
enable	bool	Kafka integration	-	false	No
brokers	[]string	List of Kafka broker addresses	["kafka0:9092", "kafka1:9092"]	-	Yes

ha

Path: .common.ha

Field	Type	Description	Example	Default	Required
enable	bool	HA mode; when true caches are backed by MongoDB instead of in-memory storage.	-	false	No
cache_database_name	string	MongoDB database name used for caches.	-	vc_cache	No

branding

Path: .common.branding

Field	Type	Description	Example	Default	Required
logo_path	string	File path to a custom logo PNG image; when empty, the built-in SUNET logo is used	-	-	No
favicon_path	string	File path to a custom favicon PNG image; when empty, the built-in SUNET favicon is used	-	-	No

credential_metadata entry

Path: .common.credential_metadata.<credential scope>

https://openid.net/specs/openid-4-verifiable-credential-issuance-1_0.html#name-credential-issuer-metadata-p

Field	Type	Description	Example	Default	Required
display	array	Display: OPTIONAL. A non-empty array of objects, where each object contains the display properties of the supported Credential for a certain language.	-	-	No
claims	array	Claims: OPTIONAL. A non-empty array of claims description objects as defined in Appendix B.2.	-	-	No

display entry

Path: .common.credential_metadata.<credential scope>.display[]

Field	Type	Description	Example	Default	Required
name	string	Name: REQUIRED. String value of a display name for the Credential.	-	-	Yes
locale	string	Locale: OPTIONAL. String value that identifies the language of this object represented as a language tag taken from values defined in BCP47 [RFC5646]. Multiple display objects MAY be included for separate languages. There MUST be only one object for each language identifier.	-	-	No
logo	object	Logo: OPTIONAL. Object with information about the logo of the Credential	-	-	No
description	string	Description: OPTIONAL. String value of a description of the Credential.	-	-	No
background_color	string	BackgroundColor: OPTIONAL. String value of a background color of the Credential represented as numerical color values defined in CSS Color Module Level 37 [CSS-Color].	-	-	No
background_image	object	BackgroundImage: OPTIONAL. Object with information about the background image of the Credential. At least the following parameter MUST be included:	-	-	No
text_color	string	TextColor: OPTIONAL. String value of a text color of the Credential represented as numerical color values defined in CSS Color Module Level 37 [CSS-Color].	-	-	No

logo

Path: .common.credential_metadata.<credential scope>.display[].logo, .apigw.issuer_metadata.display[].logo

Field	Type	Description	Example	Default	Required
uri	string	URI: REQUIRED. String value that contains a URI where the Wallet can obtain the logo of the Credential Issuer. The Wallet needs to determine the scheme, since the URI value could use the https: scheme, the data: scheme, etc.	-	-	Yes
alt_text	string	AltText: OPTIONAL. String value of the alternative text for the logo image.	-	-	No

background_image

Path: .common.credential_metadata.<credential scope>.display[].background_image

Field	Type	Description	Example	Default	Required
uri	string	URI REQUIRED. String value that contains a URI where the Wallet can obtain the background image of the Credential from the Credential Issuer. The Wallet needs to determine the scheme, since the URI value could use the https: scheme, the data: scheme, etc.	-	-	Yes

claims entry

Path: .common.credential_metadata.<credential scope>.claims[]

https://openid.net/specs/openid-4-verifiable-credential-issuance-1_0.html#name-claims-description-for-issu

Field	Type	Description	Example	Default	Required
path	[]string	Path: REQUIRED. A non-empty array representing a claims path pointer that specifies the path to a claim within the credential.	-	-	Yes
mandatory	bool	Mandatory: OPTIONAL. Boolean which, when set to true, indicates that the Credential Issuer will always include this claim.	-	-	No
display	array	Display: OPTIONAL. A non-empty array of objects containing display properties for the claim.	-	-	No

display entry

Path: .common.credential_metadata.<credential scope>.claims[].display[]

Field	Type	Description	Example	Default	Required
name	string	Name: OPTIONAL. String value of a display name for the claim.	-	-	No
locale	string	Locale: OPTIONAL. String value that identifies the language of this object.	-	-	No

apigw (Top-level)

Configuration for the API Gateway service that handles credential issuance requests.

apigw

Path: .apigw

Field	Type	Description	Example	Default	Required
api_server	object	HTTP API server configuration	-	-	Yes
admin_ui_enable	bool	The admin web UI. When false (default), the /ui routes are not registered. This must be explicitly set to true to enable the admin interface.	-	false	No
key_config	object	Signing key configuration	-	-	Yes
data_sources	object	Credential types to their data sources	-	-	Yes
auth_providers	object	How users authenticate (SAML, OIDC)	-	-	No
remotes	object	Named external API connections referenced by DataSources.ExternalAPI	"ladok"	-	No
delivery	object	Delivery groups credential delivery to wallets (OpenID4VCI, credential offers)	-	-	Yes
issuer_metadata	object	OpenID4VCI issuer metadata	-	-	No
public_url	string	Public URL of this service (must be valid HTTP/HTTPS URL)	"https://issuer.sunet.se"	-	Yes
issuer_client	object	GRPC client config for issuer	-	-	Yes
registry_client	object	GRPC client config for registry	-	-	Yes
identity_mapping_import	object	Automatic import of identity mappings from JSON files at startup. When configured, APIGW reads JSON files and imports them into the identity mappings collection on first startup (skipped if data already exists).	-	-	No
trust	object	Trust evaluation configuration for OpenID4VP credential validation. When configured, credentials presented via VP are validated against a PDP.	-	-	No

api_server

Path: .apigw.api_server, .issuer.api_server, .verifier.api_server, .registry.api_server

Field	Type	Description	Example	Default	Required
addr	string	Listen address for the HTTP server	-	:8080	No
served_by_header	string	The X-Served-By response header value for HA troubleshooting. Empty (default): header is not set. "hostname": uses os.Hostname(). Any other value is used as-is.	-	-	No
tls	object	TLS	-	-	No
api_auth	object	API Auth	-	-	No
cors	object	CORS	-	-	No
trust_proxy_tls	bool	The Secure flag on session cookies even when TLS is not enabled on this server. Use this when running behind a TLS-terminating reverse proxy.	-	false	No

tls

Path: .apigw.api_server.tls, .issuer.api_server.tls, .verifier.api_server.tls, .registry.api_server.tls

Field	Type	Description	Example	Default	Required
enable	bool	TLS	-	false	No
cert_file_path	string	Path to the TLS certificate	-	-	Yes
key_file_path	string	Path to the TLS private key	-	-	Yes

api_auth

Path: .apigw.api_server.api_auth, .issuer.api_server.api_auth, .verifier.api_server.api_auth, .registry.api_server.api_auth

JWKS and OIDC are mutually exclusive If neither is enabled, no authentication is applied (open access)

When Rules (and/or RulesFile) are configured, each authenticated request is checked against a SPOCP engine. A query of the form

(vc (service <SERVICE>)(method <HTTP_METHOD>)(path <REQUEST_PATH>)(subject <JWT_SUBJECT>))

is evaluated; the request is allowed only if a matching rule exists. The <SERVICE> value is supplied by the calling service at middleware registration time. When two services share endpoints, rules for one service do not grant access to the other. When no rules are configured, any valid Bearer JWT grants access.

Field	Type	Description	Example	Default	Required
jwks	object	Static JWKS Bearer token authentication configuration When enabled, requests are validated against a manually configured JWKS URL	-	-	No
oidc	object	OIDC Bearer token authentication configuration When enabled, the JWKS endpoint is auto-discovered from the issuer's .well-known/openid-configuration and Bearer JWTs are validated locally The RP fields (client_id, redirect_uri, etc.) also enable the admin UI login flow via OIDC redirect	-	-	No
rules	[]string	SPOCP S-expression authorization rules loaded into an in-process engine When non-empty the middleware builds a query per request and checks it Rules apply regardless of whether JWKS or OIDC is the active auth method	["(vc (service apigw)(method POST)(path /api/v1/upload)(subject alice))"]	-	No
rules_file	string	Optional path to a file containing SPOCP rules (one per line) Rules from this file are loaded in addition to the inline Rules list	-	-	No

jwks

Path: .apigw.api_server.api_auth.jwks, .issuer.api_server.api_auth.jwks, .verifier.api_server.api_auth.jwks, .registry.api_server.api_auth.jwks

Field	Type	Description	Example	Default	Required
enable	bool	Static JWKS Bearer token authentication	-	false	No
jwks_url	string	URL of the JSON Web Key Set used to validate token signatures	"https://auth.example.com/.well-known/jwks.json"	-	Yes (if enabled)
issuer	string	Expected "iss" claim. Tokens with a different issuer are rejected	-	-	Yes (if enabled)
audience	string	Expected "aud" claim. Tokens that do not contain this audience are rejected	-	-	Yes (if enabled)

oidc

Path: .apigw.api_server.api_auth.oidc, .issuer.api_server.api_auth.oidc, .verifier.api_server.api_auth.oidc, .registry.api_server.api_auth.oidc

It serves two purposes:

• API auth: Bearer JWTs in Authorization headers are validated locally against the provider's JWKS (auto-discovered from IssuerURL).
• Admin UI login: the RP fields (ClientID, RedirectURI, Scopes) enable an authorization-code redirect flow so admins log in via the OIDC provider.

Field	Type	Description	Example	Default	Required
enable	bool	OIDC authentication	-	false	No
issuer_url	string	OIDC provider's issuer URL used for discovery and "iss" claim validation.	"https://auth.example.com"	-	Yes (if enabled)
audience	string	Expected "aud" claim. Tokens that do not contain this audience are rejected.	-	-	Yes (if enabled)
client_id	string	OAuth2 client identifier registered with the OIDC provider.	-	-	Yes (if enabled)
client_secret	string	OAuth2 client secret. May be empty for public clients.	-	-	No
redirect_uri	string	Callback URL for the admin UI OIDC login flow (e.g. "https://apigw.example.com/ui/callback").	"https://apigw.example.com/ui/callback"	-	Yes (if enabled)
scopes	[]string	OAuth2/OIDC scopes to request (default: ["openid"]).	-	-	No

cors

Path: .apigw.api_server.cors, .issuer.api_server.cors, .verifier.api_server.cors, .registry.api_server.cors

Field	Type	Description	Example	Default	Required
allowed_origins	[]string	List of allowed CORS origins	["https://wallet.sunet.se", "https://app.sunet.se"]	[]	No

key_config

Path: .apigw.key_config, .issuer.key_config, .verifier.key_config, .registry.token_status_lists.key_config

Supports both file-based and HSM-based keys with explicit control.

Field	Type	Description	Example	Default	Required
private_key_path	string	File-based configuration	-	-	Yes (if pkcs11 not set)
chain_path	string	Path to certificate chain (optional)	-	-	No
pkcs11	object	HSM-based configuration	-	-	Yes (if private_key_path not set)
source	object	Source selection (determines which config to use) If empty, tries in order: File (if FilePath set), then HSM (if HSM set)	-	-	No
enable_file	bool	File-based key loading (default: true if FilePath set)	-	-	No
enable_hsm	bool	HSM-based key loading (default: true if HSM set)	-	-	No
priority	array	Fallback order when both are enabled If nil, uses Source field or auto-detects based on what's configured	["hsm", "file"]	-	No

pkcs11

Path: .apigw.key_config.pkcs11, .issuer.key_config.pkcs11, .verifier.key_config.pkcs11, .registry.token_status_lists.key_config.pkcs11

Field	Type	Description	Example	Default	Required
module_path	string	Path to the PKCS#11 library	"/usr/lib/softhsm/libsofthsm2.so"	-	No
slot_id	uint	HSM slot ID	0	-	No
pin	string	User PIN for the slot	"1234"	-	No
key_label	string	Label of the key to use	"my-signing-key"	-	No
key_id	string	Identifier for the JWT kid header	"key-1"	-	No

data_sources

Path: .apigw.data_sources

Each key under a data source is a credential type.

Field	Type	Description	Example	Default	Required
datastore	object	Credential types backed by a pre-loaded datastore (e.g. MongoDB)	-	-	No
assertion	object	Credential types backed by authentication assertions (SAML attributes or OIDC claims)	-	-	No
external_api	object	Credential types backed by an external API Each credential references a named remote defined in APIGW.Remotes	-	-	No

datastore

Path: .apigw.data_sources.datastore

Field	Type	Description	Example	Default	Required
scopes	object	Credential scope names to their datastore configuration	-	-	No
import	object	Automatic data import from JSON files at startup. When configured, APIGW reads JSON files and imports them into the datastore on first startup (skipped if data already exists).	-	-	No

scopes entry

Path: .apigw.data_sources.datastore.scopes.<credential scope>

Field	Type	Description	Example	Default	Required
auth_provider	string	Auth provider for this credential type (openid4vp, saml, or oidc)	-	-	Yes
auth_claims	[]string	The normalized claim names used for datastore identity lookup. These names must match the BSON field names under "identities." in the datastore. Use attribute_mappings (in auth_providers) to normalize provider-specific attribute names (e.g. SAML urn:oid:2.5.4.42, eIDAS date_of_birth) to these canonical names. Available identity fields: given_name, family_name, birth_date, birth_place, authentic_source_person_id, personal_administrative_number.	[given_name, family_name, birth_date]	-	No
auth_scopes	[]string	Credential keys whose VCTs are acceptable for wallet authentication (for OpenID4VP)	[pid]	-	No

import

Path: .apigw.data_sources.datastore.import

Field	Type	Description	Example	Default	Required
file_paths	[]string	JSON files to import into the datastore. Each JSON file should contain a map of person IDs to CompleteDocument objects. Import is skipped if the datastore already contains data.	["./bootstrapping/pid.json", "./bootstrapping/ehic.json"]	-	Yes
users	[]string	Users limits which person IDs to import. If empty, all persons are imported.	["100", "102"]	-	No

assertion

Path: .apigw.data_sources.assertion

Field	Type	Description	Example	Default	Required
scopes	object	Credential scope names to their assertion configuration	-	-	No

scopes entry

Path: .apigw.data_sources.assertion.scopes.<credential scope>

The data comes directly from the SAML attributes or OIDC claims.

Field	Type	Description	Example	Default	Required
auth_provider	string	Auth provider for this credential type (saml or oidc)	-	-	Yes

external_api

Path: .apigw.data_sources.external_api

Field	Type	Description	Example	Default	Required
scopes	object	Credential scope names to their external API configuration	-	-	No

scopes entry

Path: .apigw.data_sources.external_api.scopes.<credential scope>

Field	Type	Description	Example	Default	Required
remote	string	Name of a remote defined in Remotes	-	-	Yes
auth_provider	string	Auth provider to identify the user (saml or oidc)	-	-	Yes
attribute_mapping	object	How to map API response data to credential claims	-	-	No

attribute_mapping entry

Path: .apigw.data_sources.external_api.scopes.<credential scope>.attribute_mapping.<attribute>, .apigw.auth_providers.saml.attribute_mapping.<attribute>, .apigw.auth_providers.oidc.attribute_mapping.<attribute>

Generic across protocols (SAML, OIDC, etc.) - uses protocol-specific identifiers as keys

Field	Type	Description	Example	Default	Required
claim	string	Target claim name (supports dot-notation for nesting)	"identity.given_name"	-	Yes
required	bool	Required indicates if this attribute must be present in the assertion/response	-	false	No
transform	string	Optional transformation to apply Supported: "lowercase", "uppercase", "trim"	-	-	No
default	string	Optional default value if attribute is missing	-	-	No

auth_providers

Path: .apigw.auth_providers

Field	Type	Description	Example	Default	Required
saml	object	The SAML SP auth provider	-	-	No
oidc	object	The OIDC RP auth provider	-	-	No

saml

Path: .apigw.auth_providers.saml

Field	Type	Description	Example	Default	Required
enable	bool	SAML support (default: false)	-	false	No
entity_id	string	SAML SP entity identifier (typically the metadata URL)	"https://issuer.sunet.se/saml/metadata"	-	Yes (if enabled)
metadata_url	string	Public URL where SP metadata is served (optional, auto-generated if empty)	-	-	No
mdq_server	string	Base URL for MDQ (Metadata Query Protocol) server (must end with /) Mutually exclusive with StaticIDPMetadata	"https://md.sunet.se/entities/"	-	No
static_idp_metadata	object	A single static IdP as alternative to MDQ Mutually exclusive with MDQServer	-	-	No
certificate_path	string	Path to X.509 certificate for SAML signing/encryption TODO(pki): Migrate to pki.KeyConfig for consistency with other services and to enable HSM-backed SAML signing keys in the future.	-	-	Yes (if enabled)
private_key_path	string	Path to private key for SAML signing/encryption TODO(pki): See CertificatePath TODO — both fields would be replaced by a single KeyConfig.	-	-	Yes (if enabled)
acs_endpoint	string	Assertion Consumer Service URL where IdP sends SAML responses	"https://issuer.sunet.se/saml/acs"	-	Yes (if enabled)
session_duration	int	Maximum time in seconds an in-flight SAML authentication flow (AuthnRequest → Response) may remain active before it expires	-	300	No
attribute_mapping	object	AttributeMapping normalizes provider-specific attribute names (e.g. SAML OIDs) to canonical claim names. Applied to ALL attributes in the assertion. Which normalized attributes are used depends on the data source: - assertion: VCTM determines which go into the credential - datastore: auth_claims determines which are used for DB identity lookup	-	-	Yes (if enabled)
metadata_signing_cert_path	string	Path to the X.509 certificate used to verify metadata signatures. When set, all fetched metadata (MDQ and static) must carry a valid XML signature from this certificate.	-	-	No
metadata_cache_ttl	int	MetadataCacheTTL in seconds (default: 3600) - how long to cache IdP metadata from MDQ	-	-	No

static_idp_metadata

Path: .apigw.auth_providers.saml.static_idp_metadata

Field	Type	Description	Example	Default	Required
entity_id	string	IdP entity identifier	-	-	Yes
metadata_path	string	File path to IdP metadata XML (mutually exclusive with MetadataURL)	-	-	Yes (if metadata_url not set)
metadata_url	string	HTTP(S) URL to fetch IdP metadata from (mutually exclusive with MetadataPath)	-	-	No

oidc

Path: .apigw.auth_providers.oidc

Field	Type	Description	Example	Default	Required
enable	bool	OIDC RP support (default: false)	-	false	No
registration	object	How the client obtains credentials from the OIDC Provider. Exactly one of preconfigured or dynamic must be set: - preconfigured: pre-registered client_id and client_secret - dynamic: RFC 7591 dynamic client registration (credentials obtained at startup)	-	-	Yes (if enabled)
redirect_uri	string	Callback URL where the OIDC Provider sends the authorization response	"https://issuer.sunet.se/oidcrp/callback"	-	Yes (if enabled)
issuer_url	string	OIDC Provider's issuer URL for discovery Used for .well-known/openid-configuration discovery	"https://accounts.google.com"	-	Yes (if enabled)
scopes	[]string	OAuth2/OIDC scopes to request (at least one scope is required, e.g. "openid")	-	["openid", "profile", "email"]	No
session_duration	int	Maximum time in seconds an in-flight OIDC authorization flow (state, nonce, PKCE verifier) may remain active before it expires	-	300	No
client_name	string	Human-readable name for the OIDC client, shown during dynamic registration or consent	-	-	No
client_uri	string	URL to the client's homepage, used for display during consent	-	-	No
logo_uri	string	URL to the client's logo image, shown during consent screens	-	-	No
contacts	[]string	List of email addresses for responsible parties of this client	-	-	No
tos_uri	string	URL to the client's Terms of Service document	-	-	No
policy_uri	string	URL to the client's Privacy Policy document	-	-	No
attribute_mapping	object	AttributeMapping normalizes OIDC claim names to canonical claim names. Optional: when omitted, OIDC claims pass through as-is (standard names already match). Which normalized attributes are used depends on the data source: - assertion: VCTM determines which go into the credential - datastore: auth_claims determines which are used for DB identity lookup	-	-	No

registration

Path: .apigw.auth_providers.oidc.registration

Exactly one of Preconfigured or Dynamic must be set.

Field	Type	Description	Example	Default	Required
preconfigured	object	Preconfigured uses pre-registered client credentials. Set this when the client is already registered with the OIDC Provider.	-	-	Yes (if dynamic not set)
dynamic	object	Dynamic uses RFC 7591 dynamic client registration. Set this when the client should register itself at startup.	-	-	Yes (if preconfigured not set)

preconfigured

Path: .apigw.auth_providers.oidc.registration.preconfigured

Field	Type	Description	Example	Default	Required
enable	bool	Enable activates preconfigured client credentials	-	-	No
client_id	string	OIDC client identifier	-	-	Yes (if enabled)
client_secret	string	OIDC client secret	-	-	Yes (if enabled)

dynamic

Path: .apigw.auth_providers.oidc.registration.dynamic

When set, client credentials are obtained automatically at startup and persisted in the database.

Field	Type	Description	Example	Default	Required
enable	bool	Enable activates dynamic client registration	-	-	No
initial_access_token	string	Bearer token for registration Required by some OIDC Providers (e.g., Keycloak)	-	-	Yes (if enabled)

remotes entry

Path: .apigw.remotes.<remote name>

Field	Type	Description	Example	Default	Required
type	object	API protocol type	-	-	Yes
base_url	string	Base URL of the API endpoint	"https://api.ladok.se/eduapi"	-	Yes
token_url	string	OAuth 2.0 token endpoint for Client Credentials Grant	"https://api.ladok.se/oauth2/token"	-	Yes
client_id	string	OAuth 2.0 client identifier	-	-	Yes
client_secret	string	OAuth 2.0 client secret	-	-	Yes
scopes	[]string	OAuth 2.0 scopes to request	-	-	No
timeout	duration	HTTP client timeout	-	10s	No

delivery

Path: .apigw.delivery

Field	Type	Description	Example	Default	Required
openid4vci	object	The OpenID4VCI Authorization Server for wallet credential issuance	-	-	Yes
credential_offers	object	Credential offer wallet configurations	-	-	Yes

openid4vci

Path: .apigw.delivery.openid4vci

Field	Type	Description	Example	Default	Required
token_endpoint	string	OAuth2 token endpoint URL	"https://verifier.sunet.se/token"	-	Yes
clients	object	OAuth2 client configurations	-	-	Yes

clients entry

Path: .apigw.delivery.openid4vci.clients.<client id>, .verifier.inbound.openid4vp.clients.<client id>

Field	Type	Description	Example	Default	Required
type	string	Client type per RFC 6749 Section 2.1 ("public" or "confidential"). Defaults to "public" since registered clients are wallets (native/web apps) that cannot securely store credentials and rely on PKCE instead.	-	public	No
redirect_uri	string	Allowed redirect URI for the client	"https://example.com/callback"	-	Yes
scopes	[]string	List of OAuth2 scopes allowed for the client	-	-	Yes

credential_offers

Path: .apigw.delivery.credential_offers

Field	Type	Description	Example	Default	Required
issuer_url	string	Issuer URL for credential offers	-	-	Yes
wallets	object	Wallet redirect configurations	-	-	Yes

wallets entry

Path: .apigw.delivery.credential_offers.wallets.<wallet name>

Field	Type	Description	Example	Default	Required
label	string	Display label for the wallet	-	-	Yes
redirect_uri	string	Wallet redirect URI	"eudi-wallet://credential-offer"	-	Yes

issuer_metadata

Path: .apigw.issuer_metadata

Field	Type	Description	Example	Default	Required
authorization_servers	[]string	The authorization server URLs	-	-	No
deferred_credential_endpoint	string	Deferred credential endpoint	-	-	No
notification_endpoint	string	Notification endpoint	-	-	No
cryptographic_binding_methods_supported	[]string	The supported binding methods	-	-	No
credential_signing_alg_values_supported	[]string	The supported signing algorithms	-	-	No
proof_signing_alg_values_supported	[]string	The supported proof algorithms	-	-	No
credential_response_encryption	object	Response encryption configuration	-	-	No
batch_credential_issuance	object	Batch issuance configuration	-	-	No
display	array	Display metadata	-	-	No

credential_response_encryption

Path: .apigw.issuer_metadata.credential_response_encryption

Field	Type	Description	Example	Default	Required
alg_values_supported	[]string	AlgValuesSupported: REQUIRED. Array containing a list of the JWE [RFC7516] encryption algorithms (alg values) [RFC7518] supported by the Credential and Batch Credential Endpoint to encode the Credential or Batch Credential Response in a JWT [RFC7519].	-	-	Yes
enc_values_supported	[]string	EncValuesSupported: REQUIRED. Array containing a list of the JWE [RFC7516] encryption algorithms (enc values) [RFC7518] supported by the Credential and Batch Credential Endpoint to encode the Credential or Batch Credential Response in a JWT [RFC7519].	-	-	Yes
encryption_required	bool	EncryptionRequired: REQUIRED. Boolean value specifying whether the Credential Issuer requires the additional encryption on top of TLS for the Credential Response. If the value is true, the Credential Issuer requires encryption for every Credential Response and therefore the Wallet MUST provide encryption keys in the Credential Request. If the value is false, the Wallet MAY chose whether it provides encryption keys or not.	-	-	No

batch_credential_issuance

Path: .apigw.issuer_metadata.batch_credential_issuance

Field	Type	Description	Example	Default	Required
batch_size	int	BatchSize: REQUIRED. Integer value specifying the maximum array size for the proofs parameter in a Credential Request.	-	-	Yes

display entry

Path: .apigw.issuer_metadata.display[]

Field	Type	Description	Example	Default	Required
name	string	Name: OPTIONAL. String value of a display name for the Credential Issuer.	-	-	No
locale	string	Locale: OPTIONAL. String value that identifies the language of this object represented as a language tag taken from values defined in BCP47 [RFC5646]. There MUST be only one object for each language identifier.	-	-	No
logo	object	Logo: OPTIONAL. Object with information about the logo of the Credential Issuer. Below is a non-exhaustive list of parameters that MAY be included:	-	-	No

issuer_client

Path: .apigw.issuer_client, .apigw.registry_client, .issuer.registry_client

Field	Type	Description	Example	Default	Required
addr	string	GRPC server address	"issuer:8090"	-	Yes
tls	bool	TLS	-	false	No
cert_file_path	string	Client certificate for mTLS	-	-	No
key_file_path	string	Client private key for mTLS	-	-	No
ca_file_path	string	CA certificate to verify the server	-	-	No
server_name	string	Server name for TLS verification (optional)	-	-	No

identity_mapping_import

Path: .apigw.identity_mapping_import

Field	Type	Description	Example	Default	Required
file_paths	[]string	JSON files containing identity mappings to import. Each JSON file should contain a map of person IDs to arrays of IdentityMapping objects. Import is skipped if the identity mappings collection already contains data.	["./bootstrapping/identity_mappings.json"]	-	Yes
users	[]string	Users limits which person IDs to import. If empty, all persons are imported.	["100", "102"]	-	No

trust

Path: .apigw.trust, .verifier.trust

This is used for validating W3C VC Data Integrity proofs and other trust-related operations.

Trust evaluation operates in one of two modes:

• When PDPURL is configured: "default deny" mode - all trust decisions go through the PDP
• When PDPURL is empty: "allow all" mode - keys are resolved but always considered trusted

Field	Type	Description	Example	Default	Required
pdp_url	string	URL of the AuthZEN PDP (Policy Decision Point) service for trust evaluation. When set, operates in "default deny" mode - trust decisions require PDP approval. When empty, operates in "allow all" mode - resolved keys are always considered trusted.	"https://trust.sunet.se/pdp"	-	No
local_did_methods	[]string	Which DID methods can be resolved locally without go-trust. Self-contained methods like "did:key" and "did:jwk" are always resolved locally.	-	["did:key", "did:jwk"]	No
trust_policies	object	Per-role trust evaluation policies. The key is the role (e.g., "issuer", "verifier") and the value contains policy settings.	-	-	No
allowed_signature_algorithms	[]string	AllowedSignatureAlgorithms restricts which JWT signature algorithms are accepted. If empty, defaults to a secure set: ES256, ES384, ES512, RS256, RS384, RS512, PS256, PS384, PS512, EdDSA. The "none" algorithm is NEVER allowed regardless of configuration.	["ES256", "ES384", "ES512", "EdDSA"]	-	No

trust_policies entry

Path: .apigw.trust.trust_policies.<role>, .verifier.trust.trust_policies.<role>

Field	Type	Description	Example	Default	Required
trust_frameworks	[]string	The accepted trust frameworks for this role.	["did:web", "did:ebsi", "etsi-tl", "openid-federation", "x509"]	-	No
trust_anchors	[]string	Trusted root entities for this role. Format depends on the trust framework (e.g., DID for did:web, federation entity for OpenID Fed).	-	-	No
require_revocation_check	bool	RequireRevocationCheck enforces revocation status checking for this role. Default: false	-	false	No

issuer (Top-level)

Configuration for the Issuer service that signs and issues verifiable credentials.

issuer

Path: .issuer

Field	Type	Description	Example	Default	Required
api_server	object	HTTP API server configuration	-	-	Yes
grpc_server	object	GRPC server configuration	-	-	Yes
key_config	object	Signing key configuration	-	-	Yes
jwt_attribute	object	JWT credential attribute configuration	-	-	Yes
issuer_url	string	Issuer identifier URL	"https://issuer.sunet.se"	-	Yes
registry_client	object	Registry gRPC client config	-	-	No
mdoc	object	MDL/mdoc configuration	-	-	No
audit_log	object	Audit log configuration	-	-	No

grpc_server

Path: .issuer.grpc_server, .registry.grpc_server

Field	Type	Description	Example	Default	Required
addr	string	GRPC server listen address	-	:8090	No
tls	object	MTLS configuration	-	-	No

tls

Path: .issuer.grpc_server.tls, .registry.grpc_server.tls

Field	Type	Description	Example	Default	Required
enable	bool	Enable	-	false	No
cert_file_path	string	Server certificate	-	/pki/grpc_server.crt	Yes (if enabled)
key_file_path	string	Server private key	-	/pki/grpc_server.key	Yes (if enabled)
client_ca_path	string	CA to verify client certificates (for mTLS)	-	/pki/client_ca.crt	Yes (if enabled)
allowed_client_fingerprints	object	SHA256 fingerprint -> friendly name	a1b2c3...: issuer-prod	-	No
allowed_client_dns	object	Friendly name -> Certificate Subject DN	apigw-prod: CN=apigw,O=SUNET	-	No

jwt_attribute

Path: .issuer.jwt_attribute

In a later state this should be placed under authentic source in order to issue credentials based on that configuration.

Field	Type	Description	Example	Default	Required
issuer	string	Issuer of the token	https://issuer.sunet.se	-	Yes
static_host	string	Static host of the issuer, expose static files, like pictures.	-	-	No
enable_not_before	bool	The time not before which the token is valid	-	false	No
valid_duration	int64	Valid duration of the token in seconds	-	3600	No
verifiable_credential_type	string	VerifiableCredentialType URL	https://credential.sunet.se/identity_credential	-	Yes
status	string	Status status of the Verifiable Credential	-	-	No
kid	string	Kid key id of the signing key	-	-	No

mdoc

Path: .issuer.mdoc

Field	Type	Description	Example	Default	Required
certificate_chain_path	string	Path to the PEM certificate chain TODO(pki): Consider folding into pki.KeyConfig.ChainPath to unify certificate chain loading with the standard key material configuration pattern.	-	-	Yes
default_validity	duration	Default credential validity (default: 365 days)	-	8760h	No
digest_algorithm	string	Digest algorithm: "SHA-256", "SHA-384", or "SHA-512"	-	SHA-256	No

audit_log

Path: .issuer.audit_log

Field	Type	Description	Example	Default	Required
enable	bool	Audit logging	-	false	No
destinations	[]string	List of log destinations (console/stdout, file path, or HTTP URL)	["stdout", "/var/log/audit.log", "https://audit.sunet.se/webhook"]	-	Yes (if enabled)
file_sync_interval	duration	Fsync behavior for file destinations. 0 = fsync after every write (strict durability, lower throughput). >0 = periodic batched fsync at the given interval (better throughput, bounded data-loss window). Has no effect on console or webhook destinations.	-	5s	No

verifier (Top-level)

Configuration for the Verifier service that verifies credentials and acts as an OIDC Provider.

verifier

Path: .verifier

Field	Type	Description	Example	Default	Required
api_server	object	HTTP API server configuration	-	-	Yes
public_url	string	Public URL of this service (must be valid HTTP/HTTPS URL)	"https://verifier.sunet.se"	-	Yes
key_config	object	Signing key configuration	-	-	Yes
preferred_vp_formats	object	Informational VP formats and algorithms supported by wallets	-	-	No
supported_wallets	object	Supported wallet configurations	-	-	No
inbound	object	Inbound groups inbound credential verification	-	-	No
outbound	object	Outbound groups outbound identity assertion	-	-	No
digital_credentials	object	W3C Digital Credentials API configuration	-	-	No
authorization_page_css	object	Authorization page styling configuration	-	-	No
credential_display	object	Credential display settings	-	-	No
trust	object	Trust evaluation configuration	-	-	No

preferred_vp_formats

Path: .verifier.preferred_vp_formats

Used in client_metadata and Wallet metadata to indicate supported formats and algorithms.

Field	Type	Description	Example	Default	Required
ldp_vc	object	Configuration for W3C VC Data Integrity format (ldp_vc)	-	-	No
jwt_vc_json	object	Configuration for JWT-based W3C VC format (jwt_vc_json)	-	-	No
dc+sd-jwt	object	Configuration for SD-JWT VC format (dc+sd-jwt)	-	-	No
mso_mdoc	object	Configuration for ISO mdoc format (mso_mdoc)	-	-	No

ldp_vc

Path: .verifier.preferred_vp_formats.ldp_vc

Field	Type	Description	Example	Default	Required
proof_type_values	[]string	Non-empty array containing identifiers of proof types supported. If present, the proof type of the presented VC/VP MUST match one of the array values.	["DataIntegrityProof", "Ed25519Signature2020"]	-	No
cryptosuite_values	[]string	Non-empty array containing identifiers of crypto suites supported. Used when one of the algorithms in ProofTypeValues supports multiple crypto suites.	["ecdsa-rdfc-2019", "ecdsa-sd-2023", "eddsa-rdfc-2022", "bbs-2023"]	-	No

jwt_vc_json

Path: .verifier.preferred_vp_formats.jwt_vc_json

Field	Type	Description	Example	Default	Required
alg_values	[]string	Non-empty array containing identifiers of cryptographic algorithms supported. If present, the alg JOSE header of the presented VC/VP MUST match one of the array values.	-	-	No

dc+sd-jwt

Path: .verifier.preferred_vp_formats.dc+sd-jwt

Field	Type	Description	Example	Default	Required
sd-jwt_alg_values	[]string	Non-empty array containing cryptographic algorithm identifiers supported for the Issuer-signed JWT of an SD-JWT.	-	-	No
kb-jwt_alg_values	[]string	Non-empty array containing cryptographic algorithm identifiers supported for a Key Binding JWT (KB-JWT).	-	-	No

mso_mdoc

Path: .verifier.preferred_vp_formats.mso_mdoc

Field	Type	Description	Example	Default	Required
issuerauth_alg_values	[]int	Non-empty array containing cryptographic algorithm identifiers supported for IssuerAuth COSE signatures.	-	-	No
deviceauth_alg_values	[]int	Non-empty array containing cryptographic algorithm identifiers supported for DeviceAuth COSE signatures or MACs.	-	-	No

inbound

Path: .verifier.inbound

Field	Type	Description	Example	Default	Required
openid4vp	object	OpenID4VP configuration for accepting wallet presentations	-	-	Yes

openid4vp

Path: .verifier.inbound.openid4vp

Field	Type	Description	Example	Default	Required
presentation_timeout	int	Presentation timeout in seconds	-	300	No
supported_credentials	array	Supported credential configurations	-	-	Yes
presentation_requests_dir	string	Optional directory with presentation request templates	-	-	No
token_endpoint	string	OAuth2 token endpoint URL used for VP token exchange	"https://verifier.sunet.se/token"	-	Yes
clients	object	OAuth2 client configurations for RP interactions	-	-	Yes

supported_credentials entry

Path: .verifier.inbound.openid4vp.supported_credentials[]

Field	Type	Description	Example	Default	Required
vct	string	Verifiable credential type	"urn:eudi:pid:1"	-	Yes
scopes	[]string	OIDC scopes that grant access to this credential	-	-	Yes

outbound

Path: .verifier.outbound

Field	Type	Description	Example	Default	Required
oidc_provider	object	OIDC Provider configuration for asserting verified identity to downstream RPs	-	-	No

oidc_provider

Path: .verifier.outbound.oidc_provider

This configures how the verifier issues ID tokens and access tokens to relying parties. Note: This is NOT related to verifiable credential issuance (see IssuerConfig for VC issuance). The signing key is shared from the parent Verifier.KeyConfig.

Field	Type	Description	Example	Default	Required
issuer	string	OIDC Provider identifier that appears in ID tokens and discovery metadata. This identifies the verifier as an OpenID Provider. Must match the 'iss' claim in all issued ID tokens.	"https://verifier.sunet.se"	-	Yes
enable_userinfo	bool	When true, the OP advertises a userinfo_endpoint in discovery and issues JWT access tokens (RFC 9068). When false (default), only ID tokens are returned — no access_token, refresh_token, or userinfo endpoint.	true	false	No
session_duration	int	Session duration in seconds	-	3600	No
code_duration	int	Authorization code duration in seconds	-	300	No
access_token_duration	int	Access token duration in seconds (only used when enable_userinfo is true)	-	3600	No
id_token_duration	int	ID token duration in seconds	-	3600	No
refresh_token_duration	int	Refresh token duration in seconds	-	86400	No
subject_type	string	Subject type: "public" or "pairwise"	-	-	Yes
subject_salt	string	Salt for pairwise subject generation	-	-	Yes
static_clients	array	List of pre-configured OIDC clients These clients are checked in addition to dynamically registered clients	-	-	No

static_clients entry

Path: .verifier.outbound.oidc_provider.static_clients[]

Static clients are configured in YAML and do not require dynamic registration. These clients are checked in addition to dynamically registered clients stored in the database.

Field	Type	Description	Example	Default	Required
client_id	string	Unique identifier for the client	-	-	Yes
client_secret	string	Client secret for authentication. Can be defined in the secrets file under verifier.oidc_op.static_clients as a map of client_id to client_secret. Required unless TokenEndpointAuthMethod is "none" (public client).	-	-	No
redirect_uris	[]string	List of allowed redirect URIs for this client	-	-	Yes
allowed_scopes	[]string	List of scopes this client is allowed to request. If empty, defaults to standard OIDC scopes (openid, profile, email, address, phone).	-	-	No
token_endpoint_auth_method	string	Authentication method for the token endpoint. Supported values: client_secret_basic, client_secret_post, none (public client) Default: "client_secret_basic"	-	client_secret_basic	No
grant_types	[]string	List of allowed grant types. Supported values: authorization_code, refresh_token Default: ["authorization_code"]	-	["authorization_code"]	No
response_types	[]string	List of allowed response types. Supported values: code Default: ["code"]	-	["code"]	No
client_name	string	Optional human-readable name for the client	-	-	No

digital_credentials

Path: .verifier.digital_credentials

Field	Type	Description	Example	Default	Required
enable	bool	W3C Digital Credentials API support in browser	-	false	No
use_jar	bool	JWT Authorization Request (JAR) for wallet communication When true, request objects are signed JWTs instead of plain JSON	-	false	No
preferred_formats	[]string	The order of preference for credential formats Supported values: "vc+sd-jwt", "dc+sd-jwt", "mso_mdoc" Default: ["vc+sd-jwt", "dc+sd-jwt", "mso_mdoc"]	-	["vc+sd-jwt", "dc+sd-jwt", "mso_mdoc"]	No
response_mode	string	The OpenID4VP response mode for DC API flows Supported values: "dc_api.jwt" (encrypted), "direct_post.jwt" (signed), "direct_post" Default: "dc_api.jwt"	-	dc_api.jwt	No
allow_qr_fallback	bool	Automatic fallback to QR code if DC API is unavailable Default: true	-	true	No
deep_link_scheme	string	DeepLinkScheme for mobile wallet integration	"eudi-wallet://"	-	No

authorization_page_css

Path: .verifier.authorization_page_css

Field	Type	Description	Example	Default	Required
custom_css	string	Inline CSS that will be injected into the authorization page Allows deployers to override default styling without modifying templates	-	-	No
css_file	string	Path to an external CSS file to include If both CustomCSS and CSSFile are provided, both are included	-	-	No
theme	string	Predefined color scheme: "light" (default), "dark", "blue", "purple"	-	light	No
primary_color	string	PrimaryColor overrides the primary brand color	"#667eea"	-	No
secondary_color	string	SecondaryColor overrides the secondary brand color	"#764ba2"	-	No
logo_url	string	A URL to a custom logo image	-	-	No
title	string	Title overrides the page title (default: "Wallet Authorization")	-	-	No
subtitle	string	Subtitle overrides the page subtitle	-	-	No

credential_display

Path: .verifier.credential_display

Field	Type	Description	Example	Default	Required
enable	bool	Users to optionally view credential details before completing authorization When enabled, a checkbox appears on the authorization page	-	false	No
require_confirmation	bool	Users to review credentials before proceeding When true, the credential display step is mandatory (checkbox is pre-checked and disabled)	-	false	No
show_raw_credential	bool	The raw VP token/credential in the display page Useful for debugging and technical users	-	false	No
show_claims	bool	The parsed claims that will be sent to the RP Recommended for transparency and user consent	-	true	No
allow_edit	bool	Users to redact certain claims before sending to RP (future feature) Currently not implemented	-	false	No

registry (Top-level)

Configuration for the Registry service that manages credential status.

registry

Path: .registry

Field	Type	Description	Example	Default	Required
api_server	object	HTTP API server configuration	-	-	Yes
public_url	string	Public URL of this service (must be valid HTTP/HTTPS URL)	"https://registry.sunet.se"	-	Yes
grpc_server	object	GRPC server configuration	-	-	Yes
token_status_lists	object	Token Status List configuration	-	-	Yes
admin_gui	object	Admin GUI configuration	-	-	No

token_status_lists

Path: .registry.token_status_lists

Field	Type	Description	Example	Default	Required
key_config	object	Key configuration for signing Token Status List tokens.	-	-	Yes
token_refresh_interval	int64	How often (in seconds) new Token Status List tokens are generated. Default: 43200 (12 hours). Min: 301 (>5 minutes), Max: 86400 (24 hours)	-	43200	No
section_size	int64	Number of entries (decoys) per section. Default: 1000000 (1 million)	-	1000000	No
rate_limit_requests_per_minute	int	Maximum requests per minute per IP for token status list endpoints. Default: 60	-	60	No

admin_gui

Path: .registry.admin_gui

Field	Type	Description	Example	Default	Required
enable	bool	The admin GUI	-	false	No
username	string	Admin username	-	admin	Yes (if enabled)
password	string	Admin password	-	-	Yes (if enabled)

Secrets File Reference

The structure of the separate secrets file.

Secrets file structure

Path: (root)

When Common.SecretFilePath is set, secret values in config.yaml are cleared; only non-empty fields from this file are applied. Fields omitted or left empty here remain at their zero value.

Field	Type	Description	Example	Default	Required
common	object	Common	-	-	No
apigw	object	APIGW	-	-	No
registry	object	Registry	-	-	No
verifier	object	Verifier	-	-	No

common

Path: .common

Field	Type	Description	Example	Default	Required
mongo	object	Mongo	-	-	No

mongo

Path: .common.mongo

Field	Type	Description	Example	Default	Required
uri	string	MongoDB connection string, which may include authentication credentials	-	-	No

apigw

Path: .apigw

Field	Type	Description	Example	Default	Required
api_server	object	API Server	-	-	No
auth_providers	object	Auth Providers	-	-	No

api_server

Path: .apigw.api_server

Field	Type	Description	Example	Default	Required
api_auth	object	API Auth	-	-	No

api_auth

Path: .apigw.api_server.api_auth

Field	Type	Description	Example	Default	Required
oidc	object	OIDC	-	-	No

oidc

Path: .apigw.api_server.api_auth.oidc

Field	Type	Description	Example	Default	Required
client_secret	string	OAuth2 client secret for the OIDC provider	-	-	No

auth_providers

Path: .apigw.auth_providers

Field	Type	Description	Example	Default	Required
oidc	object	OIDC	-	-	No

oidc

Path: .apigw.auth_providers.oidc

Field	Type	Description	Example	Default	Required
registration	object	Registration	-	-	No

registration

Path: .apigw.auth_providers.oidc.registration

Field	Type	Description	Example	Default	Required
preconfigured	object	Preconfigured	-	-	No
dynamic	object	Dynamic	-	-	No

preconfigured

Path: .apigw.auth_providers.oidc.registration.preconfigured

Field	Type	Description	Example	Default	Required
client_secret	string	Shared secret for the pre-configured OIDC RP client	-	-	No

dynamic

Path: .apigw.auth_providers.oidc.registration.dynamic

Field	Type	Description	Example	Default	Required
initial_access_token	string	Bearer token required by the OP for dynamic client registration	-	-	No

registry

Path: .registry

Field	Type	Description	Example	Default	Required
admin_gui	object	Admin GUI	-	-	No

admin_gui

Path: .registry.admin_gui

Field	Type	Description	Example	Default	Required
password	string	Admin GUI login password	-	-	No

verifier

Path: .verifier

Field	Type	Description	Example	Default	Required
outbound	object	Outbound	-	-	No

outbound

Path: .verifier.outbound

Field	Type	Description	Example	Default	Required
oidc_provider	object	OIDC Provider	-	-	No

oidc_provider

Path: .verifier.outbound.oidc_provider

Field	Type	Description	Example	Default	Required
subject_salt	string	Secret value used to derive pairwise subject identifiers for OIDC clients	-	-	No
static_clients	object	Client_id to client_secret for static OIDC clients. Only clients listed here will have their secrets applied; clients not present in this map keep whatever value the main config provides (which will be empty after ClearSecrets).	<client_id>: "<client_secret>"	-	No

Example secrets.yaml

Path: file referenced by .common.secret_file_path

common:
  mongo:
    uri: "mongodb://user:password@mongo:27017/vc"
apigw:
  api_server:
    api_auth:
      oidc:
        client_secret: "your-oidc-client-secret"
  auth_providers:
    oidc:
      registration:
        preconfigured:
          client_secret: "your-oidc-client-secret"
        dynamic:
          initial_access_token: "<secret-value>"
registry:
  admin_gui:
    password: "change-me-in-production"
verifier:
  outbound:
    oidc_provider:
      subject_salt: "random-salt-for-pairwise-subjects"
      static_clients:
        <client_id>: "<client_secret>"