How do you safely tell backend that user is Coil user?

[Tyvole]

I need to pass this information to backend, im not going to rely on JS to tell me if user is Coil user or not.  

 

I want to know if i should allow access to premium feature on my platform or if i should also send Advertisement info in HTTP REPLY.

Yhe there is a problem - I dont even want to send ad data to user if he is coil user, bud in order to know that i need to get in REQUEST something that identifies him as paying COIL USER, HOW THE HELL I ACHIEVE THIS?

Any ideas?

[ADingoAteMyXRP]

Here ya go Bud! https://coil.com/docs/