2004

Table of Contents
Introduction to Instant Payment Notifi cation (IPN) 1
IPN in Action 2
Instant Payment Notifi cation
How It Works 5
IPN Variables 5
Restrictions on Field Lengths and Data Types 5
Using IPN
Setting up IPN 13
Notifi cation Validation 13
Specifying Your Notifi cation URL 14
Using IPN with Subscriptions and Recurring Payments
Subscriptions Variables 15
Variables for Each Subscription Type 16
Testing IPN
Using IPN with Multiple Currencies
payment_gross and payment_fee 22
Multi-currency IPN Variables 22
Additional Variables 24
Where to Get Help with IPN
PayPal Help 28
PayPal Developer Discussion Boards 28