Get all webhook subscriptions

{
    "items": [
        {
            "uuid": "123e4567-e89b-12d3-a456-426614174000",
            "name": "My Subscription",
            "url": "https://example.com",
            "active": true,
            "triggers": [
                "recipient_completed"
            ],
            "workspace_id": "Nq8htXxFssmhRxAPSP4SBP",
            "shared_key": "587c22285F57883db3ee",
            "status": "ACTIVE"
        }
    ]
}