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PayPal Express Checkout Error on Open Cart v3.0.3.1

RBLRShop
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Contributor

I use Opencart online shop and recently upgraded to v3.0.3.1

I have asked Opencart about this error, and they say to ask PayPal, so here I am.

Everything works fine except the PayPal Express Checkout.

When processing the payment all the normal options are there, but when the customer clicks on the yellow/gold PayPal Express button they get the PayPal popup box which is blank, seems to be connecting to something, then displays one line of text at the top which looks something like;
{"token":"EC-42Y453306A965952G"}


The sale fails.
I have uninstalled and reinstalled the PayPal Express extension and I have regenerated the link credentials all with no success.

The site is using PHP 7.2 (and was for a month at least without issue).

 

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