We have done some tests over at easyWooCommerce and managed to narrow it down to the following while using WooCommerce: When we add the Header Image in the PayPal Express settings page, we get the error code 10437 as in the image attached. As soon as the Header Image is removed, the gateway works fine. When we add only the Logo Image, the gateway still works fine, but the image does not show up anywhere. We will investigate further and report here as soon as we find the solution.
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