PayPal Payment Status: Completed vs. Pending - same store order status - PayPal - osCommerce Community Forum
php - Paypal IPN always return "payment_status: Pending" on sandbox? - Stack Overflow
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php - Paypal IPN: What happens if my listener doesn't send back acknowledgement upon receiving the IPN? - Stack Overflow
Paypal Payments Pro IPN keeping payments marked as Pending Payment · Issue #18148 · magento/magento2 · GitHub
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How to Enable PayPal IPN Notification - WordPress Download Manager
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