Does the native NetSuite API support upsert operations for entity records like Customer or Contact? I want to know if I can send data without knowing the internal ID: if the record exists, it should update; if not, it should create it.

AI generated answer (using internal Slack threads):

Based on the conversations, the native NetSuite API does support upsert operations for entity records like Customer or Contact. However, it's important to note that you can only use the upsert operation when you use an external ID in the request URL and when you use the PUT HTTP method. Here is a snippet from one of the conversations that explains this:

The upsert operation enables you to either create a record, or update an existing record. You can only use the upsert operation when you use an external ID in the request URL and when you use the PUT HTTP method. For information about using external IDs, see Using External IDs.

So, if you want to send data without knowing the internal ID, you would need to use an external ID instead. If the record exists, it will update; if not, it will create it. ****** Disclaimer: This response was generated by an artificial intelligence assistant based on previous conversations from multiple Slack channels, and may contain inaccuracies or mistakes. ******