---
title: "Initialize the library"
url: "https://docs.adyen.com/point-of-sale/classic-library-deprecation/classic-library-integrations/com-extension-for-windows-integration/key-steps-com-extension/initialize-the-library-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/initialize-the-library-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/initialize-the-library-com-extension"
last_modified: "2019-05-01T13:10:00+02:00"
language: "en"
---

# Initialize the library

[View source](/point-of-sale/classic-library-deprecation/classic-library-integrations/com-extension-for-windows-integration/key-steps-com-extension/initialize-the-library-com-extension.md)

Before the library can be used, you must initialize it using the `InitLibrary` method.

## POS Object

| Name  | Description                                            |
| ----- | ------------------------------------------------------ |
| `POS` | POS object representing the cash register application. |

## Method

| Name          | Description                                                                                                              |
| ------------- | ------------------------------------------------------------------------------------------------------------------------ |
| `InitLibrary` | Initializes the library and sets the environment, merchant name, cash register name, integrator name, and library flags. |

## Parameters

| Name             | Type   | Required                                                                                    | Description                                                                                                                                                                                                                                                                           |
| ---------------- | ------ | ------------------------------------------------------------------------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| `environment`    | long   | ![-white\_check\_mark-](/user/data/smileys/emoji/white_check_mark.png "-white_check_mark-") | Environment flag. Set as `1` for the Test environment and `2` for the Live environment.                                                                                                                                                                                               |
| `merchantName`   | String | ![-white\_check\_mark-](/user/data/smileys/emoji/white_check_mark.png "-white_check_mark-") | The merchant account used for the cash register application registration.                                                                                                                                                                                                             |
| `appName`        | String | ![-white\_check\_mark-](/user/data/smileys/emoji/white_check_mark.png "-white_check_mark-") | The cash register name.Format this value like so: **Cash register company and product** /** Cash register product version** / **Adyen integration name** / **Adyen integration version**. For example,  **Acme Corp POS** / **1.2.1** / **Acme Adyen connector** / **0.1 ** |
| `flags`          | long   | ![-x-](/user/data/smileys/emoji/x.png "-x-")                                                | A set of [library flags](/point-of-sale/classic-library-deprecation/classic-library-integrations/com-extension-for-windows-integration/key-steps-com-extension/initialize-the-library-com-extension/library-flags).                                                                   |
| `integratorName` | String | ![-x-](/user/data/smileys/emoji/x.png "-x-")                                                | The name of the integrator company for logging.This value should be the name of the company deploying cash register or Point-of-Sale solution, for example,  **Retail Consultancy Corp.**                                                                                             |

Check the `intCallResult` value immediately to indicate if the C library received the request without error.

## Callback

| Name            | Description                                       |
| --------------- | ------------------------------------------------- |
| `InitLibraryCB` | Returns the result of the library initialization. |