I need to make a change in script of cloudhealth custom pricebook in which billingRuleType I need to change but I am not able to make any changes.
Hello,
Welcome to our community. If I am understanding, are you not able to change anything in that request body even after you have forked that collection ?
Once you have forked the collection into your own workspace or are working with it in a team workspace you can consider making this a dynamic variable using pre- request scripts and variables with postman.
Here is an example of dynamic requests with 30 days of Postman . On day 25 you will see an example of how you can go about working with these types of requests.
Ideally you may need something like : Dynamic variables | Postman Learning Center
Your request seems to have multiline input.
If you are not able to edit that collection, try duplicate request change body. to have proper json body.
In dothttp, you could avoid these formatting issues via multiline string with triple quotes.
POST "https://chapi.cloudhealthtech.com/v1/1120128......"
json({
"specification" : """
<xml input>
"""
}