Recently, when trying to checkout as a guest user (or non-logged in user), it is not possible to continue with the PayPal transaction because I get the error: Incorrect username or password. Please help me with what to do because this was not the case before.
Many thanks in advance.
The page I need help with: [log in to see the link]
That is not the PayPal plugin that is displaying that notice. Some other code on your website is causing that behavior. The response from your server is:
You have some plugin that’s blocking the WordPress REST API. You should whitelist at least the “/wp-json/wc-ppcp” endpoint since that is what this plugin uses.