mTLS on Connect-Rest

I need to connect to an external rest service that requires mTLS. Is there documentation as to what needs to be configured on the rest connector rule, along with any other requirements that must be completed? Note: we are not on Pega Cloud.

@Jerome@quavo need to pass the username & passowrd or certificate from WS-Security profile in advance tab of Connect-Rest rule. and the details should be provided by the service provider.