Import crt certificates in Outsystems Cloud

I am just started to learn outsystems and now evaluating it.
I am trying to use web services that require crt certificates, that can be downloaded from api service provider. I was told that this can be achieved :
"You can also use client certificates with the Agile Platform to make web service calls - simply add the certificates in Service Center (in CRT format) in Administration -> Certificates, then configure your web-reference to use them to make the call in the eSpace properties."
But in that path there is only 
and no certificates.
Second way is using oAuth tokens. Hava any one any suggestions how to achieve that in outsystems ?