Checking if a patreon user has a tier in my page and own a product in my shop different methods in php? [closed]

I have a patreon page with products in my shop and subscription tiers too. I am new to patreon so not understanding it fully.

For my external website, I want user to login with patreon and check if user owns a product from the shop and also check if user owns a subscription tier.

Are these methods different of checking the subscriptions and products.

Thank you so much in advanced