Hello Everyone!! I am trying to get all the vendors using https://xyz-sb1.suitetalk.api.netsuite.com/services/rest/record/v1/vendor but I get this on sandbox account. Is there any way I can use the vendor response?

It's telling you exactly what's wrong? There's nothing more to say?

@CD Does this work in production if I enable this feature?

There is a SuiteAnswer covering this in more detail. Search for REST and Beta. But generally, for the records which are still in Beta status (like Vendor), you have to first sign up with Oracle's Beta program, and then you can start pulling these records via the REST API. BUT! NetSuite does not recommend you plan to do this in a live production account, since all of the details about the record and the API's access to it might change on any given date - until its gets the "GA" (generally available) status assigned to it in a future update.