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PayPal IPN Code Samples

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This repository contains samples in multiple languages for validating PayPal IPN messages.

Please Note

The Payment Card Industry (PCI) Council has mandated that early versions of TLS be retired from service. All organizations that handle credit card information are required to comply with this standard. As part of this obligation, PayPal is updating its services to require TLS 1.2 for all HTTPS connections. At this time, PayPal will also require HTTP/1.1 for all connections. Click here for more information

IPN Overview

  • PayPal Instant Payment Notification is a call back system that will get initiated once a transaction is completed (e.g. when an express checkout completed successfully).
  • You will receive the transaction-related IPN variables on your IPN url that you have specified in your request, otherwise it will default to the IPN url set in your PayPal account.
  • You must send these IPN variables back to PayPal servers for verification. Upon verification, PayPal will send a response string with "VERIFIED" or "INVALID".
  • If your server fails to respond with a successful HTTP response (200), PayPal will resend this IPN either until a success is received or up to 16 times.
  • If your server consistently fails to respond, your IPN may be disabled, in which case you will receive an notification on your primary paypal email address.

How to run these samples

  • IPN Listener script samples are provided for different languages.
  • Deploy IPN Listener script in a cloud environment or you can expose your server port using any third party local tunneling software, so that you can receive PayPal IPN callback.
  • You can test your software using the PayPal IPN Simulator. Ensure your listener is validating the sandbox messages at the correct testing endpoint.

License

Read License for more licensing information.

Contributing

Read here for more information.

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