Hello @Brunius,
Thank you for posting to the PayPal Merchant Community.
The error message "Things don't appear to be working..." is a generic error message. Here are the main reasons that you may be receiving this error message:
Merchant Trying to pay themselves, this is considered cash advancing a restricted activity
Incorrect Variable
Variable with special characters like " in them
Setting on the account
Email being used in integration not added or confirmed on your PayPal Account
I tested your button code that was provided, and it is working in both live and sandbox. I didn't see any reason for your buyers to get that error message with the button code that was shared, unless the email on the payment button is not added or confirmed on your PayPal Account.
You can update this line of code to your merchant id:
<input type="hidden" name="business" value="*******@***.org">
Here is how to get your merchant id:
Log into your PayPal Account
Click on your name at the top right
Click on account settings
Click on Business information
You should see the PayPal Merchant ID, which can be used in place of an email address.
Thank you,
Jennifer
MTS
PayPal
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