id in the body is required and must equal the {id} in the URL.If-Match with the version you last read to avoid overwriting someone else's change. If the version has moved on, the server returns 409.Authorization: Bearer ********************{
"resourceType": "Group",
"type": "person",
"actual": true,
"name": "Diabetes cohort 2026",
"member": [
{
"entity": {
"reference": "Patient/example"
}
}
],
"id": "123"
}{
"resourceType": "Group",
"type": "person",
"actual": true,
"name": "Diabetes cohort 2026",
"member": [
{
"entity": {
"reference": "Patient/example"
}
}
],
"id": "123",
"meta": {
"versionId": "2",
"lastUpdated": "2026-08-28T10:00:00Z"
}
}