GST practitioner

HELO SIR

                           WHETHER A CA IN PRACTICE IS REQUIRED TO ENROLL AS A GST PRACTITIONERS TO FILE  GST RETURNS  OF CLIENTS AND BECOME AUTHORISED REPRESENTATIVE  UNDER GST LAW

first of all thanx

                mam whether he "can" means optional or mandatory

i already 25 june Submit PCT-1 application But Pending for Validation Error Shown And ARN Not Received what is ?

What is the benefit of registration in gst practitioner ? 

[url=gazabhai.com] :) [/url]