Get class with instances

{
    "object": "class",
    "id": "cls_abc123",
    "name": "Morning Yoga Flow",
    "category": "YOGA",
    "instructor": "Chioma Adeyemi",
    "description": "A calming morning flow suitable for all levels",
    "provider_name": "FitHub Lagos",
    "address": "5 Adeola Odeku Street, Victoria Island, Lagos",
    "distance_km": 3.1,
    "schedule": "Mon, Wed, Fri at 07:00",
    "duration_minutes": 60,
    "price": 0,
    "currency": "NGN",
    "credit_cost": 3,
    "spots_total": 20,
    "spots_remaining": 8,
    "next_instance": 1746853200000,
    "upcoming_instances": [
        {
            "object": "class_instance",
            "id": "ci_abc123",
            "scheduled_for": 1746853200000,
            "spots_remaining": 8,
            "bookable": true
        },
        {
            "object": "class_instance",
            "id": "ci_def456",
            "scheduled_for": 1747026000000,
            "spots_remaining": 15,
            "bookable": true
        },
        {
            "object": "class_instance",
            "id": "ci_ghi789",
            "scheduled_for": 1747198800000,
            "spots_remaining": 0,
            "bookable": false
        }
    ],
    "created": 1746700000000,
    "message": "Class retrieved successfully"
}