> You are reading the Docusign Developer Documentation. For clean Markdown of any page, append .md to the page URL.
>
> Documentation indexes by section:
> - APIs and SDKs: https://docusign.docs.buildwithfern.com/docs/llms.txt
> - Platform 101: https://docusign.docs.buildwithfern.com/platform/llms.txt
> - Extension Apps: https://docusign.docs.buildwithfern.com/extension-apps/llms.txt
> - Docusign CLI: https://docusign.docs.buildwithfern.com/docusign-cli/llms.txt
>
> Authentication (OAuth, JWT Grant, M2M): https://docusign.docs.buildwithfern.com/platform/auth
> Webhooks and Connect: https://docusign.docs.buildwithfern.com/platform/webhooks
>
> OpenAPI specifications: https://docusign.docs.buildwithfern.com/openapi.json
> MCP server: https://docusign.docs.buildwithfern.com/_mcp/server

# Use a form to register an extension app

> Learn how to register an extension app using a guided form-based UI.

This procedure explains how to register an extension app using a form. You also have the option of registering an extension app by [constructing a JSON app manifest file](/extension-apps/build-an-extension-app/register/use-manifest). See [Form-based and app manifest method comparison](/extension-apps/build-an-extension-app/register#form-based-and-app-manifest-method-comparison) for guidance about which method might be more useful.

> **Note**
>
> Before starting this procedure, make sure that you have completed or obtained the items listed in [Prerequisites for registering an extension app](/extension-apps/build-an-extension-app/register#prerequisites-for-registering-an-extension-app).

To register an extension app using a form:

1. Log in to the [Developer Console](https://devconsole.docusign.com).
2. Select **Create App**, and then **Using a form-based experience**.
   ![Create App button](/_fern-files/_img/143bd4e2a1d77731cc55a6d803ebd94706399f601ccfb36c82f9fe8d2b3c12c1.webp)
3. Enter basic information about the app:

   ![Basic extension app information](/_fern-files/_img/e5cf61c38582204e2d0ea3d3b1c91dfc06c5cf0b446d8717c192b48029d62038.webp)

   1. **App name.** The name of your extension app. This value must be unique; the maximum length is 30 characters. This name will appear in the [Docusign App Center](https://apps.docusign.com/app-center) listing for your extension app. For a data IO extension, this name will appear in [workflows](https://support.docusign.com/s/document-item?bundleId=yff1696971835267\&topicId=dnx1696972415150.html) on the step selection and step configuration screens. For a data verification extension, this name will appear in the [Add Fields view](https://support.docusign.com/s/document-item?bundleId=ulp1643236876813\&topicId=odn1578456409392.html) when adding the extension to an envelope or template.
   2. **Published by.** The name of the extension app publisher. This value will appear with your extension app's name in all App Center locations that list your app. This value will also appear on your extension app's detail page in the App Center as the **Developer**.
   3. **Support email.** The email address of the extension app publisher. This will appear under **Resources** in the App Center listing.
4. Supply these values:

   ![Distribution settings](/_fern-files/_img/dcd6e887a6999e6ffea87b25bfa29d487b2445373d6e76da61a9750670b4f031.webp)

   1. **Distribution Type.** Determines whether your extension app will be available in production to all users (public distribution) or only to users in accounts that you specify. To publish a public extension app, you must join the [Docusign Partner Program](https://partners.docusign.com/s/join-now). For more information, see [Choosing private distribution instead of public](/extension-apps/extension-apps-101/choosing-private-distribution).
      **Note:** Once an app has been published, its distribution type cannot be changed.
   2. **Connection Grant Type**. Determines whether your extension app will use [Authorization Code Grant](/extension-apps/build-an-extension-app/it-infrastructure/authorization#authorization-code-grant) or [Client Credentials Grant](/extension-apps/build-an-extension-app/it-infrastructure/authorization#client-credentials-grant) to authorize its access to your platform. Client Credentials Grant can only be selected if your **Distribution Type** is set to **Private**.
5. Select the extensions to include. See [Supported extensions](/extension-apps/extension-apps-101/supported-extensions) for descriptions of each extension, their extension points, and links to more information.

   ![Extension type selection](/_fern-files/_img/72a5ebd6039f38cd21b695ea3bd50240c71ce0bd1b9c57f928c8f7a1aff662ef.webp)

   If you select **File Input Output**, you can select from the [supported extensions](/extension-apps/extension-apps-101/supported-extensions)  of that type.

   > **Note**
   >
   > When registering an extension app, you cannot include both a [file output system of record extension](/extension-apps/extension-apps-101/supported-extensions/file-output-system-of-record) and a [file output cloud storage extension](/extension-apps/extension-apps-101/supported-extensions/file-output-cloud-storage) in the same app. If you need to use both types of output in workflows, register a separate app for each extension.

   ![File IO extension type](/_fern-files/_img/67dae992328a0f7994980ba831a8d8e85ef2cd14cdc258f91ce35ee62659bc19.webp)

   If you select **Data Input Output**, you have the option to select whether the extension app will only read data from a system of record or whether it will both read from and write to the system of record.

   ![Data Input Output extension type selected](/_fern-files/_img/d34aa7d7300430358f7ee6b0d409c3c9bebf6287f851f485eafca38cd4857cef.webp)

   If you select **Data Verification**, you can select the type of data the extension app will verify.

   ![Extension Type Data Verification selected](/_fern-files/_img/1c5193d2617afd3f3bf8a400325756b82331e226922cb842691909c297367373.webp)
6. Select **Create App**.
7. A basic extension app registration and app manifest file are created, and the extension app **Overview** page is displayed.

   ![Overview page](/_fern-files/_img/d363d697473591d224a0a2bbd655f4aef5e40b784d0bc39b858e4c4d878f55ef.webp)

## Steps to complete extension app registration

Although your extension app registration has been created, you must complete these additional steps to supply all the required information:

* [Update the App Center listing](/extension-apps/build-an-extension-app/register/use-form/app-center-listing): Define the text and images that will be displayed to App Center users.
* [Update the integration details](/extension-apps/build-an-extension-app/register/use-form/integration-details): Define the settings required to obtain authorization and connect to the external API endpoints for the [actions](/extension-apps/extension-apps-101/concepts/actions) and [capabilities](/extension-apps/extension-apps-101/concepts/capabilities). You must complete this step before you can use the Developer Console's extension app [testing features](/extension-apps/build-an-extension-app/test).

  > **Note**
  >
  > During the form-based extension app registration process, if you select a [file IO extension](/extension-apps/extension-apps-101/supported-extensions), its required actions are automatically added to the app. You can then configure the actions' endpoint URIs and other properties on the [Integration Details](/extension-apps/build-an-extension-app/register/use-form/integration-details) page. The extension's optional capabilities can be added or removed only by [editing the app manifest file](/extension-apps/build-an-extension-app/update-registration/use-manifest). After you've added capabilities via the manifest file, you can edit them on the Integration Details page. See [Action schema](/extension-apps/extension-app-reference/app-manifest-reference/action) for information about action and capability properties in the app manifest file.

## Next steps

* Find out how to register an extension app [using an app manifest file](/extension-apps/build-an-extension-app/register/use-manifest).
* Review the options for [updating extension app registration details](/extension-apps/build-an-extension-app/update-registration).
* Learn how to [test an extension app](/extension-apps/build-an-extension-app/test).

> Learn how to register an extension app using a guided form-based UI.

## Docs

- [Update integration details](https://developers.docusign.com/extension-apps/build-an-extension-app/register/use-form/integration-details.md): Learn how to define extension app settings required to obtain authorization and connect to endpoints in the external API service.
- [Update App Center listing](https://developers.docusign.com/extension-apps/build-an-extension-app/register/use-form/app-center-listing.md): Learn how to define the text and images that appear in an extension app listing in the Docusign App Center.