Hello, We're aware of an issue impacting IPN generation / delivery within our sandbox environment and the relevant technical teams are already investigating. I'll post in the thread pinned to the top of this forum once the issue has been resolved. https://www.paypal-community.com/t5/Sandbox-Environment/IPN-is-not-fired-on-sandbox-environment/m-p/2697798#M7664 Apologies for any inconvenience. Thanks !
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