Exchange authorization code from issuer oauth provider

Client ID for VCS OIDC interaction.

Specifies the method used to authenticate the client application to the authorization server (VCS). The only supported value is "urn:ietf:params:oauth:client-assertion-type:jwt-client-attestation". It indicates that the client must authenticate using OAuth 2.0 Attestation-Based Client Authentication method.

The value MUST contain two JWTs, separated by a "~" character. The first JWT is the client attestation JWT, the second is the client attestation PoP JWT.