Changes to Set up email sending from a domain

the response property error/details became required for the status 400

the response property error/details became required for the status 401

the response property error/details became required for the status 403

the response property error/details became required for the status 404

the response property error/details became required for the status 409

the response property error/details became required for the status 429

the response property error/details became required for the status 503

the response property meta became required for the status 400

the response property meta became required for the status 401

the response property meta became required for the status 403

the response property meta became required for the status 404

the response property meta became required for the status 409

the response property meta became required for the status 429

the response property meta became required for the status 503

the response property meta/api_version became required for the status 400

the response property meta/api_version became required for the status 401

the response property meta/api_version became required for the status 403

the response property meta/api_version became required for the status 404

the response property meta/api_version became required for the status 409

the response property meta/api_version became required for the status 429

the response property meta/api_version became required for the status 503

added the required property meta/request_id to the response with the 400 status

added the required property meta/request_id to the response with the 401 status

added the required property meta/request_id to the response with the 403 status

added the required property meta/request_id to the response with the 404 status

added the required property meta/request_id to the response with the 409 status

added the required property meta/request_id to the response with the 429 status

added the required property meta/request_id to the response with the 503 status

the response property error/details became nullable for the status 400

the response property error/details became nullable for the status 401

the response property error/details became nullable for the status 403

the response property error/details became nullable for the status 404

the response property error/details became nullable for the status 409

the response property error/details became nullable for the status 429

the response property error/details became nullable for the status 503

added the required property data/domain/notify_selectable to the response with the 200 status

endpoint added