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PayPal Express Checkout Payments in OpenCart 3.x

Contributor

PayPal Express Checkout Payments in OpenCart 3.x

I set up PayPal Express Checkout Payments in my online store, and everything looks as good. But when I am trying to test the payment to see if it is working, I have got this error as It shows on the attachment. Can anyone assist me with it please to fix it?

paypal error.png