WHMCS Bridge Pro By i-plugins 6.1

This is the new version released on 11 may 2021.
It has been tested after nulling.
Thanks to @seesaycisse for testing out.

@seesaycisse mentioned that an Error 500 was happening when users are redirected to viewinvoice page after an order placement. It was fixed by adding some code in WP bridge Free version.
Now use the attached free version of wp bridge so that it works flawlessly.
Both WHMCS Bridge and WHMCS Bridge Pro (aka SSO) plugins must be
activated in WordPress