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This page is about integrating PayPal with web sites.

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Different methods of conducting a transaction, from simplest to most advanced:

Method where it happens when the payment info returns connection
PDT PayPal's site when customer returns to merchant site Customer's browser → Merchant's server
IPN PayPal's site immediately after the transaction PayPal's server → Merchant's server
NVP Merchant's site in response to merchant's server Merchant's server → PayPal's server



The "custom" field never shows up anywhere for me, even in Instant Payment Notification. Still trying to figure out what's wrong. --Woozle 18:23, 2 January 2009 (EST)