php - How can I tell if someone is subscribed with a Paypal Subscribe Button? -

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so have paypal subscribe button set on test website. it's monthly subscription user have pay gain access profile. can't seem logic right in head. might lack of knowledge paypal classic api's, i've searched has led me dead end. using php , mysql, how keep track of user , make sure subscribed and/or if cancel subscription? may lead me solving this, appreciate it. if need of code, i'll glad add , edit, don't know if code needed question.


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