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> [!NOTE]
> **Note:** Apigee Extensions are available in the Edge UI to Google Cloud Apigee customers with an Enterprise [support](https://cloud.google.com/apigee/pricing) plan.

Now that you've [added an
extension](https://docs.apigee.com/api-platform/tutorials/add-extension/add-new-extension), you can configure an instance of that extension for use in an environment.

**To configure the extension:**

1. In the **Extensions \> (My extension name)** page, click **test** to configure for the test environment.

   ![](https://docs.apigee.com/static/api-platform/images/extensions-select-test-config.png)

   The **Configurations: test** dialog box displays:

   ![](https://docs.apigee.com/static/api-platform/images/extensions-extension-configure.png)
2. Enter the following values to configure this extension for use with the Stackdriver Logging service:

   | Field | Description |
   |---|---|
   | **Version** | Select the extension version number to use. You might have multiple versions of the same extension installed on the system. |
   | **GCP Project ID** | Enter your GCP project ID. This is the project for which Stackdriver logging in enabled, and which has a service account assigned a Log Writer role. (Note that the project ID and name could be different. In the image below, \`my-gcp-project\` is used an example. However, you'll need to use your own project ID for the example to log messages. To get your project ID, open the [GCP console](https://console.cloud.google.com/) and go to **IAM \& Admin \> Settings**. |
   | **Credentials** | Paste the contents of the Service Account JSON file that you downloaded as part of [the Prerequisites](https://docs.apigee.com/api-platform/tutorials/add-extension/intro#prerequisites). Edge automatically Base64-encodes the JSON content. |

3. Click the **Save** button.
4. To deploy the extension to the test environment, click **Deploy** in the **test** row.

   Deploying the extension makes it available for requests from API proxies deployed to the
   same environment. You'll make those requests through the [ExtensionCallout policy](https://docs.apigee.com/api-platform/reference/policies/extension-callout-policy).

   When you click **Deploy**, you'll see a message such as "Deploying... This
   will take a few minutes." Don't worry, it probably won't take that long.

   When Apigee Edge has finished deploying the extension, its status will change to
   **Deployed**, as the following example shows:

   ![](https://docs.apigee.com/static/api-platform/images/extensions-extension-deployed-click-save.png)
5. To check that your extension is deployed, click the **Extensions** breadcrumb link at the top of the page, as the following example shows:

   ![](https://docs.apigee.com/static/api-platform/images/extensions-breadcrumb.png)

   The extension you just deployed should appear in the list. If the list is long,
   you can filter it by typing your extension's name in the filter box at the top of the page.

   ![](https://docs.apigee.com/static/api-platform/images/extensions-extension-in-list-deployed.png)

> [!TIP]
>
> ### Congratulations!
>
> You've deployed your extension! Now you're ready to try it out from an API proxy with the [ExtensionCallout policy](https://docs.apigee.com/api-platform/reference/policies/extension-callout-policy).

### Next step

[Step 1](https://docs.apigee.com/api-platform/tutorials/add-extension/add-new-extension)
[Step 2](https://docs.apigee.com/api-platform/tutorials/add-extension/configure-for-testing)
[Step 3: Use an ExtensionCallout policy](https://docs.apigee.com/api-platform/tutorials/add-extension/extension-callout-policy)
[Step 4](https://docs.apigee.com/api-platform/tutorials/add-extension/proxy-deployment)
[Step 5](https://docs.apigee.com/api-platform/tutorials/add-extension/xtra-credit)