Https REST Call Smart Service

Hi,

I have a requirement to integrate with another environment through secure rest calls from Appian but I am not sure which smart service I can use in Appian 16.3. I have uploaded SSL certificate in Appian but when I tried to use HttpQuery smart service, I realized there is no way to put the certificate information in. So I ran the smart service without certificate and got the PKIX certificate error. Now I am no longer sure that which smart service I can utilize for Https calls.

Any help would be highly appreciated.

Thanks,

VM