I\'m having some difficulty integrating - and finding current documentation for - integrating PayPal PayFlow Pro into my website.
There is a similar
If you're going to use any feature related to the hosted checkout page you'll need to redirect to - https://payflowlink.paypal.com
or https://pilot-payflowlink.paypal.com
The Payflow Pro URL's are specifically for API calls and they aren't something you should be redirecting buyers through.
Your account also needs to be the correct type to be able to use the hosted checkout feature. You can check what options are available to your account by logging in and checking the right side to see what products are enabled on your account.
Documentation for transparent redirect is sparse. X.com had a few posts on it but those articles haven't been moved somewhere else yet.