Thank you in advance for your response.
Hi Okamoto,
1. The treatment of a client certificate in OutSystems will depend on how it is configured. If it's a self-signed certificate, it will be treated as such. If it's authenticated by a CA, it will be treated as such.
2. It depends on the implementation, but typically, client certificates would have to be set manually for each API that requires authentication via the client certificate.
3. Yes, it is possible to add authentication by a certificate at user login in OutSystems. This can be done through custom code or by using a custom authentication plugin.