Creating a New Driver

I'm running a process that should be passing a JSON string POST request to Motive using https://api.keeptruckin.com/v1/users but I can't tell if it's doing anything. I'm getting no errors but it's also not creating the new user so I have no idea what is wrong with what I passed or if it did anything. The new user is not showing up in the portal so I assume it did not work, but I have no idea why and nothing hinting at what I may have done incorrectly.

Thanks.

Cole