📘

Note

The externalCustomerId parameter accepts only one identifier per request. Multiple values separated by a comma (or any other delimiter) aren't supported — such a request returns an empty result.

📘

Sorting the results

sortBy=contactId sorts the results in descending order — the most recently created contact is returned first.

To get the latest contact created for a given external identifier, send the request with the externalCustomerId filter and sortBy=contactId, then take the first element of the response.