curl --request POST \
  --url 'https://api.stateset.com/api/v1/fulfillment/ships/{id}/complete' \
  --header 'Authorization: Bearer YOUR_API_KEY' \
  --header 'Content-Type: application/json' \
  --data '{
  "shipped_by": null,
  "shipping_cost": null,
  "tracking_number": "string"
}'

{
  "assigned_to": null,
  "carrier": null,
  "created_at": "string",
  "id": "string",
  "order_id": "string",
  "pack_task_id": "string",
  "shipment_id": "string",
  "shipping_cost": null,
  "status": "string",
  "tracking_number": null
}