---
title: "Handle the Signature callback"
url: "https://docs.adyen.com/point-of-sale/classic-library-deprecation/classic-library-integrations/com-extension-for-windows-integration/key-steps-com-extension/process-a-basic-transaction-com-extension/handle-the-signature-callback-com-extension"
source_url: "https://docs.adyen.com/point-of-sale/classic-library-deprecation/classic-library-integrations/com-extension-for-windows-integration/key-steps-com-extension/process-a-basic-transaction-com-extension/handle-the-signature-callback-com-extension.md"
canonical: "https://docs.adyen.com/point-of-sale/classic-library-deprecation/classic-library-integrations/com-extension-for-windows-integration/key-steps-com-extension/process-a-basic-transaction-com-extension/handle-the-signature-callback-com-extension"
last_modified: "2026-05-23T12:56:20+02:00"
language: "en"
---

# Handle the Signature callback

[View source](/point-of-sale/classic-library-deprecation/classic-library-integrations/com-extension-for-windows-integration/key-steps-com-extension/process-a-basic-transaction-com-extension/handle-the-signature-callback-com-extension.md)

## Callback

| Name                   | Description                                                                                 |
| ---------------------- | ------------------------------------------------------------------------------------------- |
| `TenderCheckSignature` | The system invokes this callback if the terminal or card settings require signature as CVM. |

## Parameters

| Name        | Type                                                                                                                                                                   | Description                                                                                             |
| ----------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ------------------------------------------------------------------------------------------------------- |
| `pedObj`    | [PedDevice](/point-of-sale/classic-library-deprecation/classic-library-integrations/com-extension-for-windows-integration/com-extension-for-windows-objects/peddevice) | PED object that represents the terminal.                                                                |
| `tenderObj` | [Tender](/point-of-sale/classic-library-deprecation/classic-library-integrations/com-extension-for-windows-integration/com-extension-for-windows-objects/tender)       | The tender associated with the additional data.                                                         |
| `headerObj` | ResponseHdr                                                                                                                                                            | Header object that includes generic statuses, information about merchant, additional data from the PED. |

## Confirmation Method

| Name               | Description                                                                                            |
| ------------------ | ------------------------------------------------------------------------------------------------------ |
| `ConfirmSignature` | This method runs against the tender object. Staff must verify the signature, and confirm or reject it. |

## Parameters

| Name            | Type   | Required                                                                                    | Description                                                                                                                          |
| --------------- | ------ | ------------------------------------------------------------------------------------------- | ------------------------------------------------------------------------------------------------------------------------------------ |
| `confirmation`  | int    | ![-white\_check\_mark-](/user/data/smileys/emoji/white_check_mark.png "-white_check_mark-") | The result of signature verification. The staff member either confirms or rejects the signature.                                     |
| `signatureData` | String | ![-x-](/user/data/smileys/emoji/x.png "-x-")                                                | Base-64 encoded string of the bitmap. The PED passes the digital signature to the Adyen payments platform. Image size: 240 X 170px.  |

## Confirmation values

| Value | Meaning  |
| ----- | -------- |
| 0     | Declined |
| 1     | Approved |
| 2     | Retry    |

You can use value 2, retry, to allow shoppers to re-enter their signature.