Hi @IGmonster,
I'm sorry to hear that there is a technical issue when you try to pay an invoice. Please try clearing the cookies and cache in your browser and restart the browser. Please also make sure that you're not blocking cookies in your browser. If the problem persists after that, please log in at https://www.paypal-support.com and open a ticket to our technicians. Make sure you let them know what steps you took to troubleshoot the situation and the details about the operating system and browser you're using.
I hope this helps!
Olivia
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