Issue Summary

The order responders are returned in this endpoint no longer respects the order in which they are on-call. Specifically, the list returned in the exactNextOnCallRecipients may not be in the order the responders will be on-call.

https://docs.opsgenie.com/docs/who-is-on-call-api#get-next-on-calls

Steps to Reproduce

1. Create a schedule with two on-call rotations.
2. Perform a get next on-calls API request: https://docs.opsgenie.com/docs/who-is-on-call-api#get-next-on-calls

Expected Results

The next on-call users in both rotations are returned in the order of their on-call shifts.

Actual Results

The next on-call users in both rotations are returned but the order may not be in the order they are on-call. 

Workaround

Using a single rotation in a schedule, instead of multiple, will mean the next on-calls endpoint will always respect the order of that rotation.