This transaction could not be completed

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My app worked months ago during testing. So much that they temporarily banned my card because of doing too many refunds to quickly.

Now, when I attempt to make a customer purchase I get the error This transaction could not be completed. The customer tried with two different cards.

I called PayPal and they see nothing on their side. The payment never went that far?

The cards swipe fine. I just tried on two of my own cards and failed with the same error. The returnUrl only has UNKNOWN in the data.

I have a tax item named 'Non' with zero as the amount. The example code sets a name of Tax and sets a zero amount. The app imports the invoice and items correctly. The items get saved in the catalog, yet I cannot make a purchase.

If I load the app and manually add an item that was previously made by my app adding an invoice, the payment will go through. At one time everything worked. Now I cannot see what changed, and my implementation is broken.

Here's a screenshot of the error.

It seems the PayPal Here Android app has been updated. Maybe it broke something with sending an invoice?