<status value="draft"/> <experimental value="false"/> <date value="2022-11-04T18:21:49-06:00"/> <publisher value="HL7 (FHIR Project)"/> <contact> <telecom> <system value="url"/> <value value="http://hl7.org/fhir"/> </telecom> <telecom> <system value="email"/> <value value="fhir@lists.hl7.org"/> </telecom> </contact> <contact> <telecom> <system value="url"/> <value value="http://hl7.org/fhir"/> </telecom> <telecom> <system value="email"/> <value value="fhir@lists.hl7.org"/> </telecom> </contact> <description value="The type of method used to execute a subscription"/> <caseSensitive value="true"/> <valueSet value="http://terminology.hl7.org/ValueSet/subscription-channel-type"/> <content value="complete"/> <concept> <code value="rest-hook"/> <display value="Rest Hook"/> <definition value="The channel is executed by making a POST to the URI with the selected payload and MIME type."/> </concept> <concept> <code value="websocket"/> <display value="Websocket"/> <definition value="The channel is executed by sending a packet across a web socket connection maintained by the client. The URL identifies the websocket, and the client binds to this URL."/> </concept> <concept> <code value="email"/> <display value="Email"/> <definition value="The channel is executed by sending an email to the email addressed in the URI (which must be a mailto:)."/> </concept> <concept> <code value="message"/> <display value="Message"/> <definition value="The channel is executed by sending a message (e.g. a Bundle with a MessageHeader resource etc.) to the application identified in the URI."/> </concept> </CodeSystem>

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

Code	Display	Definition
rest-hook	Rest Hook	The channel is executed by making a POST to the URI with the selected payload and MIME type.
websocket	Websocket	The channel is executed by sending a packet across a web socket connection maintained by the client. The URL identifies the websocket, and the client binds to this URL.
email	Email	The channel is executed by sending an email to the email addressed in the URI (which must be a mailto:).
message	Message	The channel is executed by sending a message (e.g. a Bundle with a MessageHeader resource etc.) to the application identified in the URI.