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What is a PayPal IPN notification warning?

IPN is a service that notifies you about updates to your PayPal transactions. Fundraise Up doesn't utilize this service, so if you receive such a notice, it was likely triggered by another third-party tool interacting with your PayPal account.

For more information about PayPal IPN, please visit PayPal's FAQ, and their help center guide for Why did I get an email with the subject "PayPal Instant Payment Notification Warning"?