How to make test case redundant in REST for different parameter in each testcase?

Hi,

My first REST test request is as follows:

Request:

{

Parameter1: "value"

}

My Second REST test request has the same steps as first request but it has additional one parameter in the request. I need to add that to my second request. 

Request:

{

Parameter1: "value",

Parameter2:"value"}

Likewise i need to execute 18 test scenarios with different parameter. Is there any easy automation work to reduce my additional efforts? Please clarify?