This code system http://terminology.hl7.org/CodeSystem/endpoint-payload-type defines the following codes:

CodeDisplayDefinition
any AnyAny payload type can be used with this endpoint, it is either a payload agnostic infrastructure (such as a storage repository), or some other type of endpoint where payload considerations are internally handled, and not available
none NoneThis endpoint does not require any content to be sent; simply connecting to the endpoint is enough notification. This can be used as a 'ping' to wakeup a service to retrieve content, which could be to ensure security considerations are correctly handled
 <status value="draft"/> <experimental value="false"/> <date value="2022-11-04T18:21:49-06:00"/> <publisher value="HL7 Patient Administration"/> <contact> <telecom> <system value="url"/> <value value="http://hl7.org/fhir"/> </telecom> </contact> <description value="This is an example value set defined by the FHIR project, that could be used to represent possible payload document types."/> <caseSensitive value="true"/> <content value="complete"/> <concept> <code value="any"/> <display value="Any"/> <definition value="Any payload type can be used with this endpoint, it is either a payload agnostic infrastructure (such as a storage repository), or some other type of endpoint where payload considerations are internally handled, and not available"/> </concept> <concept> <code value="none"/> <display value="None"/> <definition value="This endpoint does not require any content to be sent; simply connecting to the endpoint is enough notification. This can be used as a 'ping' to wakeup a service to retrieve content, which could be to ensure security considerations are correctly handled"/> </concept> </CodeSystem>