PayPal IPN deprecated: four silent failure modes developers must know before 2027

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PayPal has deprecated its legacy Instant Payment Notification (IPN) system, halting new IPN credential generation at end of 2025, with Website Payments Standard deprecated from January 2026 and full end-of-life set for January 2027. The mandated replacement is REST-based Webhooks, but the transition is not a simple redirect — the two systems differ fundamentally in payload format, field names, data structure, and verification method. Developers who point existing IPN handlers at the new Webhook endpoint without code changes risk silent payment failures, where orders go unfulfilled even as PayPal receives an HTTP 200 response and stops retrying delivery. Key breaking differences include a shift from form-encoded to JSON payloads, deeply nested amount and status fields, a renamed custom reference field, and the complete absence of buyer email in the capture resource. Merchants relying on legacy IPN listeners — including those using WooCommerce or Gravity Forms PayPal Standard gateways — are advised to audit and rewrite their payment handlers well ahead of the 2027 deadline.

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