anyone know how to pass extra_vars in tower callback via curl?

Anybody any idea how to pass in extra_vars when doing a callback request to tower?

https://docs.ansible.com/ansible-tower/2.2.0/html/userguide/job_templates.html#ug-provisioning-callbacks

I cant see how you can combine json blob with name=value fields in a single curl request.

The response i have had from ansible support is this gist
https://gist.github.com/michelleperz/fcca30f11bcaa2d1c52f

which i cant see as solving the problem.

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