WEBHOOK Query Paramters

I wanted to verify how the POST parameters are send on a WEBHOOK HttpWebRequest.

Currently I have on a webhook the following:

api_key: 789xxxxxxxxxxxxxxx
time: 123xxxxxxxxxxxx

also when I do a publish I send “data” as “testing”

In my asp.net page I expect the request parameters:
Request.QueryString(“api_key”)= 789xxxxxxxxxxxxxxx
Request.QueryString(“time”)=123xxxxxxxxxxxx
Request.QueryString(“data”)=testing

Is this correct?

Thanks