coupon working on website but not in API

[Rawinder Dhillon]

 Hi,
 I created a coupon on website .
it works when i place order there
But while using it app or Postman via API is gives error
 "error_warning": "Error: Coupon is either invalid, expired or reached it's usage limit!",
can someone plz check

[maxter]

What can I check? Can you send your web store URL and coupon code?