Added one new API method to unsubscribe a customer from a campaign and added the "is_blocked" value to the client's update method
and
Postman collections here;
https://api.postman.com/collections/3701273-da5a592b-a1aa-480f-bd62-9ca526111906?access_key=PMAT-01J4RCB4DWB7AKCABGA18E7BFP
