What should MS Flow response look like?

[HHH]

I'm struggling with MS Flow integration. The idea being Hornbill calls MS Flow using intgration bridge to reset a user's password.

We then want Flow to return a one time URL to Hornbill using the &[global["MicrosoftFlowTriggerFlow"]["response"]] and the BPM would then post that link in the request resolution.

Can anyone shed som light into how the body of the flow should be formatted to allow this, right now the response parameter is empty despite various attempts by our Flow tech.

Thanks