This code system http://hl7.org/fhir/subscription-payload-content defines the following codes:

Code Display Definition
empty Empty No resource content is transacted in the notification payload.
id-only Id-only Only the resource id is transacted in the notification payload.
full-resource Full-resource The entire resource is transacted in the notification payload.
<status value="active"/> <experimental value="false"/> <date value="2021-01-05T10:01:24+11:00"/> <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> <description value="Codes to represent how much resource content to send in the notification payload."/> <jurisdiction> <coding> <system value="http://unstats.un.org/unsd/methods/m49/m49.htm"/> <code value="001"/> <display value="World"/> </coding> </jurisdiction> <caseSensitive value="true"/> <valueSet value="http://hl7.org/fhir/ValueSet/subscription-payload-content"/> <content value="complete"/> <concept> <code value="empty"/> <display value="Empty"/> <definition value="No resource content is transacted in the notification payload."/> </concept> <concept> <code value="id-only"/> <display value="Id-only"/> <definition value="Only the resource id is transacted in the notification payload."/> </concept> <concept> <code value="full-resource"/> <display value="Full-resource"/> <definition value="The entire resource is transacted in the notification payload."/> </concept> </CodeSystem>