Requires authentication — see Authentication.

This endpoint helps you to partially update existing contacts from a list identified by its unique ID. Edits only the fields sent in the request all contacts, the other fields remain the same. If field is not present for a contact, then it's added as new. Extra filters can be added using list's columns (e.g. email[like]=tester@example.com, age[gt]=30).

{
  "meta": {
    "timestamp": 1597166699457,
    "transactionId": "70169d77-c165-4795-9932-35b8a3af96fb",
    "explain": "a descriptive text"
  }
}