Changes to Begin an SP-initiated SAML transaction (login, link or reauth).

added the optional property error/widening to the response with the 401 status

added the optional property error/widening to the response with the 404 status

added the optional property error/widening to the response with the 429 status

added the optional property error/widening to the response with the 500 status

added the optional property error/widening to the response with the 503 status

added the new payload_too_large enum value to the error/code response property for the response status 401

added the new payload_too_large enum value to the error/code response property for the response status 404

added the new payload_too_large enum value to the error/code response property for the response status 429

added the new payload_too_large enum value to the error/code response property for the response status 500

added the new payload_too_large enum value to the error/code response property for the response status 503

added the new unprocessable enum value to the error/code response property for the response status 401

added the new unprocessable enum value to the error/code response property for the response status 404

added the new unprocessable enum value to the error/code response property for the response status 429

added the new unprocessable enum value to the error/code response property for the response status 500

added the new unprocessable enum value to the error/code response property for the response status 503

removed the payload_too_large enum value from the error/code response property for the response status 401

removed the payload_too_large enum value from the error/code response property for the response status 404

removed the payload_too_large enum value from the error/code response property for the response status 429

removed the payload_too_large enum value from the error/code response property for the response status 500

removed the payload_too_large enum value from the error/code response property for the response status 503

removed the unprocessable enum value from the error/code response property for the response status 401

removed the unprocessable enum value from the error/code response property for the response status 404

removed the unprocessable enum value from the error/code response property for the response status 429

removed the unprocessable enum value from the error/code response property for the response status 500

removed the unprocessable enum value from the error/code response property for the response status 503

added the new payload_too_large enum value to the error/code response property for the response status 401

added the new payload_too_large enum value to the error/code response property for the response status 404

added the new payload_too_large enum value to the error/code response property for the response status 429

added the new payload_too_large enum value to the error/code response property for the response status 500

added the new payload_too_large enum value to the error/code response property for the response status 503

added the new unprocessable enum value to the error/code response property for the response status 401

added the new unprocessable enum value to the error/code response property for the response status 404

added the new unprocessable enum value to the error/code response property for the response status 429

added the new unprocessable enum value to the error/code response property for the response status 500

added the new unprocessable enum value to the error/code response property for the response status 503

added the new service_unavailable enum value to the error/code response property for the response status 401

added the new service_unavailable enum value to the error/code response property for the response status 404

added the new service_unavailable enum value to the error/code response property for the response status 429

added the new service_unavailable enum value to the error/code response property for the response status 500

added the non-success response with the status 503

removed the enum value link of the request property purpose

removed the enum value login of the request property purpose

removed the enum value reauth of the request property purpose