SchedulePickupRequest

Conditional fields:

If pickup is not already scheduled: provide (externalLocationId OR pickupLocation) + serviceType + merchantName.

If pickup already scheduled: send only trackingNumber; other fields are ignored.

{
    "trackingNumber": "string",
    "externalLocationId": "string",
    "pickupLocation": {
        "streetAddress1": "string",
        "streetAddress2": "string",
        "city": "string",
        "country": "string",
        "postalCode": "string",
        "latitude": 0,
        "longitude": 0
    },
    "serviceType": "SAME_DAY",
    "merchantName": "string"
}