curl --request POST \
  --url https://api.shipbob.com/2.0/return/{id}/cancel \
  --header 'Authorization: Bearer <token>' \
  --header 'shipbob_channel_id: <shipbob_channel_id>'

{
  "channel": {
    "id": 0,
    "name": "ShipBobs-Shopify-Store"
  },
  "completed_date": "2019-08-24T14:15:22Z",
  "customer_name": "string",
  "fulfillment_center": {
    "id": 0,
    "name": "Cicero (IL)"
  },
  "id": 0,
  "insert_date": "2019-08-24T14:15:22Z",
  "inventory": [
    {
      "action_requested": {
        "action": "Default",
        "action_type": "InventoryDefault",
        "instructions": "string"
      },
      "action_taken": [
        {
          "action": "Default",
          "action_reason": "string",
          "lot_information": [
            {
              "expiration_date": "2019-08-24T14:15:22Z",
              "lot_number": "string",
              "quantity_processed": 0
            }
          ],
          "quantity_processed": 1
        }
      ],
      "id": 0,
      "name": "string",
      "quantity": 0
    }
  ],
  "invoice_amount": 0.1,
  "original_shipment_id": 0,
  "reference_id": "string",
  "return_type": "Regular",
  "status": "AwaitingArrival",
  "store_order_id": "string",
  "tracking_number": "860C8CDC8F0B4FC7AB69AC86C20539EC",
  "transactions": [
    {
      "amount": 2.5,
      "transaction_type": "ReturnLabelInvoice"
    }
  ]
}