Nintex adding "se_" as prefix to start event variable

Hi,

        I'm creating a "Component Workflow" to be accessed as REST webservice over http from other application. For that I have created a start event variable "testvar", but Nintex expects "se_testvar" in the payload from other application. How can I configure Nintex to not expect "se_" as prefix in the variable used in payload? Nintex is expecting something like this

{
"startData": {
"se_testvar": "<insert string here>"
}
}

 while I want it to expect below payload

{
"startData": {
"testvar": "<insert string here>"
}
}

Thanks,

Anurag