Does that API support multiple records at the same time?
If not, then you might need to create some sort of loop, or a data driven test using the test runner.
Is there any error information returned by the API?
If you are new to Postman. I would recommend going through the Postman training if you haven’t done so yet.
Postman Galaxy Training | Postman API Network
Run through the “APIs 101 Training”, then the “Testing and Automation Training” course.
The following links provide a bit more info about data driven testing.
Importing data files | Postman Learning Center
API Testing ‘A Beginners View’: Data-driven testing in Postman - Community showcase - Postman