I'm setting up PayPal payments through PlayFab and I noticed a couple issues with the redirects after r confirming or canceling the payment on the PayPal checkout page.
When confirming, PayPal redirects to our website just fine, but the orderId query param in the url is missing an '=' like so: mysite.com/paypal?orderId9813221252226324993. Not sure if that's on your end or PayPal.
When canceling via the "Cancel and return to XYZ" link in the PayPal checkout page, it just redirects to a PlayFab site that is empty. Something like:
I would expect it to redirect to the site we submitted in the settings.