Here is an example of how to submit a GET request to api.opsgenie.com using curl for Schedules.

~]$ curl --request GET https://api.opsgenie.com/v2/schedules --header 'Authorization: GenieKey 6760afa9-5a94-4b45-bd77-54752d4d5292'

Which should return JSON that looks something like this.

{
    "data": [
        {
            "description": "My Schedule",
            "enabled": true,
            "id": "0847efce-c378-48cb-8b74-f5bb514090e7",
            "name": "My Schedule",
            "ownerTeam": {
                id": "29eb4194-7a9f-4b3a-87b3-4949707ddc01",
                "name": "Parent Schedule",
            },
            "rotations": [],
            "timezone": "America/Chicago"
        }
    ]
}