A CAPTCHA (Completely Automated Public Turing test to share with Computers and Humans Apart) is a challenge-response test accustomed to decide if an individual is human or bot .

Captcha can be a program that protects websites from web-bots by generating tests that computer cannot pass but human can pass. And computers cannot decode the distorted words within a CAPTCHA 

 

When you talk to any services via PRPC , its basically a machine interaction and not human. Hence, I dont think you will be able to pass  this .

Alternate option could be to request the provider to make the access password protected. In that case ,you can obtain a secure user id and password and pass it as a token .. 

Lets see what other has to say 

Thank you Santanu. You are right. I did find couple posts about CAPTCHA but it seems there is no way to get past CAPTCHA systematically unless something like token is implemented as you suggested. Lets see.