Troubleshooting PayPal HTML Button Issue
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I'm in the process of integrating PayPal 'cart checkout' buttons on my website.
I first added buttons to the test version of the site (running on local host) about a week ago. I used a credit card to complete a test checkout and it worked beautifully. The next step was implementing an IPN listener. This proved more challenging than I had expected, but I finally got one that would, when tested with the IPN simulator, returing a status 200 and save the necesary information to my database. I was ecstatic!
Then I tried to test the full checkout process. At this point, front end is still running on local host, backend (written in Node.js) is running on Google Cloud App Engine. I tried to checkout, but it wouldn't even let me complete the transaction.
I completly got rid of IPN under my PayPal settings, so in theory it should be just as it was when I completed my first successful button tests. But it still doesn't work.
My button is copied and pasted directly from PayPal itself, so I'm wondering if some setting got messed up when I was trying to get the IPN listener to work.
The buttons redirect me to PayPal and I'm able to enter my credit card info, but as soon as I submit it, I get the error message:

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