# Verify device positions
Verify positions

To check the integrity of a device position use the [VerifyDevicePosition](https://docs.aws.amazon.com/location/latest/APIReference/API_WaypointTracking_VerifyDevicePosition.html) API. This API returns information about the integrity of the device's position, by evaluating properties such as the device's cell signal, Wi-Fi access point, Ipv4 address, and if a proxy is in use.

## Prerequisites


Before being able to use the listed APIs for device verification, make sure you have the following prerequisite:
+ You have created a tracker for the device or devices you want to check. For more information, see [Get started with Amazon Location Service trackers](start-tracking.md).

The following example shows a request for the Amazon Location [VerifyDevicePosition](https://docs.aws.amazon.com/location/latest/APIReference/API_WaypointTracking_VerifyDevicePosition.html) API.

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#### [ API ]

**To verify device positions using the Amazon Location APIs**

Use the `[VerifyDevicePosition](https://docs.aws.amazon.com/location/latest/APIReference/API_WaypointTracking_VerifyDevicePosition.html)` operation from the Amazon Location Tracking APIs.

The following example shows an API request to evaluate the integrity of the position of a device. Replace these values with your own device IDs.

```
POST /tracking/v0/trackers/TrackerName/positions/verify HTTP/1.1
Content-type: application/json

{
   "DeviceState": { 
      "Accuracy": { 
         "Horizontal": number
      },
      "CellSignals": { 
         "LteCellDetails": [ 
            { 
               "CellId": number,
               "LocalId": { 
                  "Earfcn": number,
                  "Pci": number
               },
               "Mcc": number,
               "Mnc": number,
               "NetworkMeasurements": [ 
                  { 
                     "CellId": number,
                     "Earfcn": number,
                     "Pci": number,
                     "Rsrp": number,
                     "Rsrq": number
                  }
               ],
               "NrCapable": boolean,
               "Rsrp": number,
               "Rsrq": number,
               "Tac": number,
               "TimingAdvance": number
            }
         ]
      },
      "DeviceId": "ExampleDevice",
      "Ipv4Address": "string",
      "Position": [ number ],
      "SampleTime": "string",
      "WiFiAccessPoints": [ 
         { 
            "MacAddress": "string",
            "Rss": number
         }
      ]
   },
   "DistanceUnit": "string"
}
```

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**Note**  
The **Integrity SDK** provides enhanced features related to device verification, and it is available for use by request. To get access to the SDK, contact [Sales Support](https://aws.amazon.com/contact-us/sales-support/?pg=locationprice&cta=herobtn).