create Credential Request
suspend fun createCredentialRequest(tokenResponse: TokenResponseParameters, issuerMetadata: IssuerMetadata): CredentialRequestParameters
Send the result as JSON-serialized content to the server at /credential (or more specific IssuerMetadata.credentialEndpointUrl). Also send along the TokenResponseParameters.accessToken from tokenResponse in HTTP header Authorization as value Bearer accessTokenValue (depending on the TokenResponseParameters.tokenType).