What are the options for restricting API access?

Question

Mobile development

Good day.

Essence of the problem:
There is an application on iOS/Android and API. It is necessary to restrict access to obtaining some data, only in a certain area (geolocation).
What can you suggest?

Answer 1

receive coordinates from the device/login/token on the server and determine (on the server) whether he has access or not.
respectively, return data or an error.