---
title: Fast Track Scan
slug: fourkites-api-reference/fast-track-scan
description: Learn about the "Scan Update" callback request parameter and its fields and descriptions, including CustomerNumber, DivisionId, FourKitesLoadId, HandlingUnits, ScanType, Timestamp, UnitId, LoadNumber, MessageType, and ReferenceNumbers.
createdAt: 2023-10-19T07:05:53.000Z
---

The **Scan Update** callback will be sent as soon as Pickup, Receive, and Delivery actions happen on the Courier tracking.

### Request Parameter

```json
{
	"CustomerNumber": "2150228645",
	"DivisionId": "009",
	"FourKitesLoadId": "360333180",
	"HandlingUnits": [
		{
			"ScanType": "pickup",
			"Timestamp": "2023-10-11T10:43:32Z",
			"UnitId": "00400962958091329830"
		}
	],
	"LoadNumber": "0007722452",
	"MessageType": "SCAN_UPDATE",
	"ReferenceNumbers": [
		"SRTE:205",
		"LID:0007722452",
		"RTE:009_205",
		"0007722452",
		"SCAC:CZPD"
	],
	"RouteNumber": "205",
	"Scac": "CZPD",
	"Shipper": "Test Shipper",
	"StopId": "939165502",
	"StopName": "005-CVS 6106",
	"Tags": [
		"009_205",
		"Knoxville FDC SHPR",
		"009",
		"SEG:PHARMA"
	]
}
```

### Field Description

| **Field Name**     | **Description**                                                | **Key Always Present?** | **Data Type**             | **Max Length**                                            |
| ------------------ | -------------------------------------------------------------- | ----------------------- | ------------------------- | --------------------------------------------------------- |
| `CustomerNumber`   | Customer Number to whom the Handling units are being delivered | No                      | String                    | Max 50                                                    |
| `DivisionId`       | Internal DivisionID associated with the shipper's organisation | No                      | String                    |                                                           |
| `FourKitesLoadId`  | Unique LoadID on FourKites                                     | Yes                     | Number                    | 20                                                        |
| `HandlingUnits`    | Array which contains the details of all individual units       | Yes                     | Array                     | No max limit                                              |
| `ScanType`         | Type of Scan: Pickup, Receive and Delivery                     | Yes                     | String                    | 50 max                                                    |
| `Timestamp`        | Time stamp of the scan occurrence                              | Yes                     | String in DateTime format |                                                           |
| `UnitId`           | Individual unit's identifier                                   | Yes                     | String                    |                                                           |
| `LoadNumber`       | Load Number in the platform                                    | Yes                     | String                    | 65535                                                     |
| `MessageType`      | Identifier for the type of callback                            | Yes                     | String                    | 1024                                                      |
| `ReferenceNumbers` | Load level reference numbers                                   | No                      | Array                     | no max                                                    |
| `RouteNumber`      | The route in which the load is travelling for Delivery         | Yes                     | String                    | 50 max                                                    |
| `Scac`             | SCAC of the carrier assigned to the shipment/load              | Yes                     | Alpha/Numeric             | 4                                                         |
| `Shipper`          | Shipper Name                                                   | Yes                     | String                    | No max, but realistically, not longer than 200 characters |
| `StopId`           | StopID of the stop in which the handling units are associated  | Yes                     |                           |                                                           |
| `StopName`         | Name of the stop in which the handling units are associated    | Yes                     |                           |                                                           |
| `Tags`             | Tags associated with the load                                  | No                      | Array of string           | 50 for each tag                                           |