Getting error on PayPal Express payment integration with OpenCart


Hi there,


We are using OpenCart on PHP 8.0. We have products with recurring payments (subscriptions). 

From our research we found PayPal express is the best for Recurring payments in Opencart.

It works fine, until the final Accept and Pay button. Then it jumps to Return to Merchant button.

This is the error message in the URL:


We suspect it must be a setting, but we are unable to determine what.

Is there anyone who can give us more information on the error code?

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