Changes to Get a notification

the response property payload became nullable for the status 200

the response property payload became optional for the status 200

added the new SERVICE_UNAVAILABLE enum value to the code response property for the response status 400

added the new SERVICE_UNAVAILABLE enum value to the code response property for the response status 401

added the new SERVICE_UNAVAILABLE enum value to the code response property for the response status 402

added the new SERVICE_UNAVAILABLE enum value to the code response property for the response status 403

added the new SERVICE_UNAVAILABLE enum value to the code response property for the response status 404

added the new SERVICE_UNAVAILABLE enum value to the code response property for the response status 409

added the new SERVICE_UNAVAILABLE enum value to the code response property for the response status 500

added the new TOO_MANY_REQUESTS enum value to the code response property for the response status 400

added the new TOO_MANY_REQUESTS enum value to the code response property for the response status 401

added the new TOO_MANY_REQUESTS enum value to the code response property for the response status 402

added the new TOO_MANY_REQUESTS enum value to the code response property for the response status 403

added the new TOO_MANY_REQUESTS enum value to the code response property for the response status 404

added the new TOO_MANY_REQUESTS enum value to the code response property for the response status 409

added the new TOO_MANY_REQUESTS enum value to the code response property for the response status 500

added the non-success response with the status 429

added the non-success response with the status 503

removed subschema #1 subschema #2 subschema #3 subschema #4 subschema #5 subschema #6 subschema #7 subschema #8 subschema #9 subschema #10 subschema #11 subschema #12 subschema #13 from the payload response property anyOf list for the response status 200