I'm using paypal recurrent payment api (NVP). when user register to my site, it goes to paypal for subscription with 14 days free trial and created their profile and return back to my site with paypal returned info. Now i want to check that registered user already used trial period or not. if already used trial period then subscription amount will be charged from now not after 14 days. Please help me regarding this process. how can i stop a user to use trial period multiple times?
Thanks