License mechanism

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i developed simple effective plug-in , have people donationware.

 

how can check if people made valid donation via paypal , give them key somehow checked.

most people know of use server components on web sites part of verification mechanism. issue registration code after donation has been received website/paypal, , think allow paypal receipt number used registration code , use call website verify receipt matches known donation.

 

building type of mechanism not easy task.

 

matt



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