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Express checkout client-side error log ??

Express checkout client-side error log ??

Hi, I have a client-side Express integration that works perfectly in a Sandbox test. (I use a webhook to listen for the results: all perfect) But when I switch to Production mode, the PayPal button loads, but tapping it does not trigger anything! How can I find out what the problem is? I do have an error callback on that page, but it doesn't fire either. Don