How to set up external site security for payments (enhanced version)
It is simpler to revert Salesforce back to the older version while adjusting Security settings. Be sure to reset back to enhanced version.
1. Navigate to Setup
1.1.Select the Cog symbol on the right hand side of your Salesforce home screen.
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1.2. A drop down menu will appear, select 'Setup'.
1.3. A new window or tab will open. In the quick search bar on left hand side type 'User Management Settings'. Disable Profile List Views and Enhanced Profile Interface Toggles
Remember to return to these areas and reverse these steps when you have completed setting up your security.