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php - Paypal IPN: What happens if my listener doesn't send back acknowledgement upon receiving the IPN? - Stack Overflow
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PayPal Standard: Simultaneous IPN and PDT responses *sometimes* reduce stock twice · Issue #24387 · woocommerce/woocommerce · GitHub
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PayPal Payment Status: Completed vs. Pending - same store order status - PayPal - osCommerce Community Forum
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