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Establishing interaction with the payment gateway
Setting up the payment page URL
Identifying yourself when exchanging with the payment gateway
Managing interaction with the merchant website
Managing security
Setting up notifications
Setting up the Instant Payment Notification
Automatic retry in case of failure
Other cases of notification
Sending a payment form via POST
Computing the signature
Example of implementation with JAVA
Example of implementation with PHP
Implementing the IPN
Preparing your environment
Retrieving data returned in the response
Computing the IPN signature
Comparing signatures
Analyzing the nature of the notification
Processing the response data
Running tests and troubleshooting
Returning to the shop
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