I am having the same issue. My website successfully links to paypal with the exception of in app links. I have no idea how to fix it. My website was done by vistaprint, so I'm not sure how to reconfigure.
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I have tried all the options above and I still can't get paypal to work. I have removed "paypal" and also tried "_self" solutions and neither help. I get all the way to putting credit card details in and then it tells me that paypal is not working at the moment... So frustrated as this should be easy. Anyone else got anything that I can try?
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Ok, was having the same issue and it was driving me insane, especially because I couldn't find a solution anywhere! But I think I figured it out! All I did was change the METHOD in the first line of the html to "add" instead of "post". I hope this helps!! <form target="paypal" action="https://www.paypal.com/cgi-bin/webscr" method="add">
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