Make someone subscribe before downloading file? [HELP]

[KyleVonnie]

Hey,

I'm trying to code something into my website, where it will force users to subscribe to my YouTube channel, or verify that they are subscribed, if they already are, before redirecting them to any download.
Any advice to start on the code or even a link? Any help is appreciated!

Thanks so much!

 

[Benden]

Learn how the YouTube API works because you'll probably need it

 

[JayC]

You must be registered for see links

You must be registered for see links

 

[brsy]

A simple google search could have done the job.

You must be registered for see links

when I searched "php check if user is subscribed youtube".