Changes to List API keys

the response property keys/items/credit_limit became nullable for the status 200

the response property keys/items/expires_at became nullable for the status 200

the error response's property type changed from object to no type for status 401

the error response's property type changed from object to no type for status 500

the error response's property type changed from object to no type for status 503

the keys/items/created_at response's property format changed from date-time to no format for status 200

removed the required property error/message from the response with the 401 status

removed the required property error/message from the response with the 500 status

removed the required property error/message from the response with the 503 status

removed the required property error/type from the response with the 401 status

removed the required property error/type from the response with the 500 status

removed the required property error/type from the response with the 503 status

removed the optional property error/code from the response with the 401 status

removed the optional property error/code from the response with the 500 status

removed the optional property error/code from the response with the 503 status

removed the optional property error/param from the response with the 401 status

removed the optional property error/param from the response with the 500 status

removed the optional property error/param from the response with the 503 status

api operation id listApiKeys removed and replaced with list_api_keys

removed the non-success response with the status 400

removed the non-success response with the status 402

removed the non-success response with the status 403

removed the non-success response with the status 410

removed the non-success response with the status 422

removed the non-success response with the status 429

added ErrorBody to the error response property allOf list for the response status 401

added ErrorBody to the error response property allOf list for the response status 500

added ErrorBody to the error response property allOf list for the response status 503

response property keys/items/credit_limit list-of-types was narrowed by removing types null from media type application/json of response 200

response property keys/items/expires_at list-of-types was narrowed by removing types null from media type application/json of response 200

added the required property keys/items/default_routing_strategy to the response with the 200 status