I sell software using Paypal as the only payment method. When I receive the payment receipt I send the customer a key number to unlock their trial version of the software and make it fully functional. They are told clearly it may take 24 hours for delivery as I verify and test the key before delivery. This has worked well for many years. A customer purchased and apparently didn't receive the key within 24 hours. This occasionally happens when their mailbox is full, the server rejects the email or it is lost in Junk or spam folders and I can normally rectify it quickly and get the key delivered promptly. However this customer didn't notify me that they hadn't received the key and instead raised a dispute with Paypal the next day for not receiving the goods. Before I received the dispute they purchased again and immediately raised another dispute. I refunded both payments a few days ago and just now they have purchased again which I promptly refunded as I do not want any more disputes. How can I prevent this situation from re-occurring. Can you block someone from purchasing?
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