We’ve seen similar PayPal-related issues before, especially when customers use privacy tools or open the payment link in another browser or device. Sometimes the order doesn’t register at all, or worse, duplicate payments occur.
In our experience, the most effective approach was to implement metadata tagging — similar to what datakick suggested — and ensure PayPal webhooks are tightly synced with the order validation process on the platform.
We’re currently running a tailored setup for one of our projects where metadata is saved before redirection and verified post-payment. That’s helped cut down these cases significantly. Happy to share more if someone’s interested.
