How can I verify a PayPal ID?

问题

I have an application writted in ASP with a simple form. The users fill up the form with their PayPal ID to receive money exchanging their points.

I want to verify the PayPal ID before they submit the form using some kind of http request. I have looking into the PayPal API but i didn't find anything.

Thanks.

回答1:

If the PayPal api doesn't support a "verify" of call, then here's the usual alternative:

1. Create a "paypal_ids" database table in your application
2. When a PayPal id is entered by someone, check your table to see if you have already validated the id for a previous transaction. If you have, then you're all set. -- You could also keep bad ids in the table, to act as a negative cache.
3. To validate a paypal id, just attempt to do a real transaction against the id, where you try to "send" 1 penny to the id. If it works, then you've validated the id. Store your results in your table and go on from there.

This is how paypal validates checking accounts--by doing a small, but real, test transaction.

来源：https://stackoverflow.com/questions/2478678/how-can-i-verify-a-paypal-id