No nopCommerce PayPal payment method works.

I started by trying the PayPalStandard plugin, i set it up, tried sandbox mode and it worked. Then i switched it to production and tried a test order, but it didn't work (PayPal gives a "Things dont appear to be working error", and forums solution link is dead: https://www.paypal-community.com/t5/PayPal-Payments-Standard/quot-Things-don-t-appear-to-be-working-at-the-moment-Please-try/td-p/1199481 )

I figured that maybe PDT was outdated, so I installed PayPalExpressCheckout by nopCommerce, set it up and everything, but not even sandbox mode works! I get the error:


Error passing cart to PayPal
10403: Maximum amount (MaxAmount) is invalid.

{"Token":null,"Timestamp":"2019-11-05T23:37:43Z","TimestampSpecified":true,"Ack":1,"CorrelationID":"f575a70aa531d","Errors":[{"ShortMessage":"Transaction refused because of an invalid argument. See additional error messages for details.","LongMessage":"Maximum amount (MaxAmount) is invalid.","ErrorCode":"10403","SeverityCode":1,"ErrorParameters":null}],"Version":"98.0","Build":"53803583","Any":null}

I added a log to see what values were being generated in GetMaxAmount:


cartTotal: 84.00, toAdd: 0, currencyCode: USD

I have SSL configured correctly, Force SSL is on, taxes are set up (fixed tax rate plugin with 0% set).
What can I check? What could I be doing wrong?

Tested on versions: 4.20 vanilla, 4.30 latest vanilla (Nov 5), 4.30 customized. None of them work.

Thank you.

No nopCommerce PayPal payment method works.

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