Transfer API Body from POSTMAN to content in REST Message Method

[LHHuy]

Hi Team,

I got a request to use REST message to access an URL with ServiceNow to get the Json data that our client need to create a record in a CMDB table.
However, I got stuck to transfer the parameter in POSTMAN to ServiceNow. In this case, the body in POSTMAN. 

I was advised to use Content to store the body, however, it's not working as expected.  Should I use the content and how to convert the parameter to the format needed in ServiceNow, as the Username and Password contain special character? 

Thank you.