Body example:

{
"requests":[
{
  "action": "upsert",
  "cuid": "myuser123",
  "cuidtype": "ihe",
  "timestamp": "2021-07-24T13:44:17+02:00",
  "data": {
  "VIP": "T",
  "contacts_buyer": "T",
  "premium_score": "0.8",
  "segment_name": null,
  "last_visit": "2020-05-16T05:50:06-05:00",
}
},

{
  "action": "upsert",
  "cuid": "myuser456",
  "cuidtype": "ihe",
  "timestamp": "2021-07-24T13:45:52+02:00",
  "data": {
  "VIP": "F",
  "contacts_buyer": "T",
  "premium_score": "0.3",
}
},

{
  "action": "upsert",
  "cuid": "0c907031b7d6515ce8def68a767272d0ec7225e987c3e0ce70b985c265f318f0",
  "cuidtype": "ihe",
  "timestamp": "2023-07-02T10:44:44+02:00",
  "data": {
  "UserSegments": ["segment 1", "segment 2"]
}
},

{
  "action": "delete",
  "cuid": "myuser789",
  "cuidtype": "ihe",
  "timestamp": "2022-05-24T12:31:09+02:00",
}
]
}

Response: Success

{ 
 "error": null, 
 "dy_trace_id": "eed3b778281fe4bd435902c8c7f854a3" 
}

Response, with error:

{ 
 "error": {
   "message": "The feedKey must match the feed key in the feed settings",
   "type": "E019"
	}, 
 "dy_trace_id": "74eb317b0a44addc30e765e6b9a83675" 
}