A. Although you can define both query and template parameters, only template parameters will be available for mapping in the mapper because query parameters are considered optional.

B. Both standard and custom HTTP headers can be defined for either the request or response.

C. If you select a PUT or POST action (HTTP method), you must define a JSON response payload format.

D. File attachments can be accepted as a request option for the Trigger interface, but you cannot include attachments as a response to the client.