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Obtaining help
Establishing interaction with the payment gateway
Setting up the payment page URL
Identifying yourself when exchanging with the payment gateway
Managing the interaction with the merchant website
Managing security
Setting up the Instant Payment Notification
Send an HTML payment form via POST
Computing the signature
Example of implementation with JAVA
Example of implementation with PHP
Analyzing the payment result
Retrieving data returned in the response
Computing the IPN signature
Comparing signatures
Processing the response data
Returning to the shop
Proceeding to testing
Making payment tests
Testing the IPN
Activating the shop in production mode
Generating the production key
Shifting your merchant website to production mode
Making a first production payment
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