> 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 # Supported extensions > See a list of the supported extensions for Docusign extension apps. The following extensions are available: | Extension type | Extension | Extension point | Description | | -------------------------------------------------------------------------------------------- | ------------------------------------------------------------------------------------------------------------------------------ | ------------------------------------------------- | ------------------------------------------------------------------------------------------------------------------- | | [Connected fields](/extension-apps/extension-apps-101/supported-extensions/connected-fields) | [Connected fields](/extension-apps/extension-app-reference/extension-contracts/connected-fields) | eSignature Add Fields view and Signing | Perform custom data verification of any types of values against your system of record, and display autofill values. | | [Data IO](/extension-apps/extension-apps-101/supported-extensions/data-io) | [Data IO](/extension-apps/extension-app-reference/extension-contracts/data-io) | Web Forms, Workflow Builder workflows | Read data from or write data to your system of record. | | Data verification | [Bank account owner verification](/extension-apps/extension-app-reference/extension-contracts/bank-account-owner-verification) | eSignature Add Fields view and Signing | Verify the identity of a bank account owner or authorized signatory. | | Data verification | [Bank account verification](/extension-apps/extension-app-reference/extension-contracts/bank-account-verification) | eSignature Add Fields view and Signing | Verify the validity of a signer’s bank account information. | | Data verification | [Email address verification](/extension-apps/extension-app-reference/extension-contracts/email-address-verification) | eSignature Add Fields view and Signing, Web Forms | Verify that an email address exists and is deliverable. | | Data verification | [Business FEIN verification](/extension-apps/extension-app-reference/extension-contracts/business-fein-verification) | eSignature Add Fields view and Signing | Verify that a business entity exists and is registered in government databases. | | Data verification | [Phone verification](/extension-apps/extension-app-reference/extension-contracts/phone-verification) | eSignature Add Fields view and Signing, Web Forms | Verify that a phone number exists and is reachable. | | Data verification | [SSN verification](/extension-apps/extension-app-reference/extension-contracts/ssn-verification) | eSignature Add Fields view and Signing | Verify the validity of an individual's social security number (SSN). | | Data verification | [Postal address verification](/extension-apps/extension-app-reference/extension-contracts/postal-address-verification) | eSignature Add Fields view and Signing | Verify the existence and deliverability of a U.S. or international address. | | File IO | [File input cloud storage](/extension-apps/extension-app-reference/extension-contracts/file-input-cloud-storage) | Agreement Manager | Import documents from cloud storage. | | File IO | [File input system of record](/extension-apps/extension-app-reference/extension-contracts/file-input-system-of-record) | Workflow Builder workflows | Import documents from a system of record. | | File IO | [File output cloud storage](/extension-apps/extension-app-reference/extension-contracts/file-output-cloud-storage) | Workflow Builder workflows | Write documents to cloud storage. | | File IO | [File output system of record](/extension-apps/extension-app-reference/extension-contracts/file-output-system-of-record) | Workflow Builder workflows | Write documents to a system of record. | | File IO | [File output tabular format](/extension-apps/extension-app-reference/extension-contracts/file-output-tabular-format) | Workflow Builder workflows | Export data from an agreement to a tabular format file. | See [Extensions](/extension-apps/extension-apps-101/concepts/extensions-and-extension-points) and [extension points](/extension-apps/extension-apps-101/concepts/extensions-and-extension-points#extension-points) for details. > **Note** > > Although Docusign continues to support existing extension apps that use the file archive extension, new extension apps should use the [file output cloud storage extension](/extension-apps/extension-apps-101/supported-extensions/file-output-cloud-storage) instead. ## Next steps * Learn about [Extension app use cases](/extension-apps/extension-apps-101/use-cases). * See details for an [Example extension app use cases](/extension-apps/build-an-extension-app/example-use-case). * View the [App manifest reference](/extension-apps/extension-app-reference/app-manifest-reference) for a full list of supported elements. * Get an introduction to [Extension app concepts](/extension-apps/extension-apps-101/concepts). > See a list of the supported extensions for Docusign extension apps. ## Docs - [Connected fields extension overview](https://developers.docusign.com/extension-apps/extension-apps-101/supported-extensions/connected-fields.md): Get an overview of an extension that performs real-time custom data verification against a system of record. - [Data IO extension overview](https://developers.docusign.com/extension-apps/extension-apps-101/supported-extensions/data-io.md): Lean how the data IO extension works, where it is used, and how it executes. - [Define related objects in a data model](https://developers.docusign.com/extension-apps/extension-apps-101/supported-extensions/data-io/related-objects.md): Learn how to define related objects in the data model for a data IO extension app. - [Data model](https://developers.docusign.com/extension-apps/extension-apps-101/supported-extensions/data-model.md): Learn about the data model that Docusign extension apps use. - [File input cloud storage extension overview](https://developers.docusign.com/extension-apps/extension-apps-101/supported-extensions/file-input-cloud-storage.md): Import agreements from a cloud storage service to the Docusign Navigator smart repository. - [File input system of record extension overview (beta)](https://developers.docusign.com/extension-apps/extension-apps-101/supported-extensions/file-input-system-of-record.md) - [File output cloud storage extension overview](https://developers.docusign.com/extension-apps/extension-apps-101/supported-extensions/file-output-cloud-storage.md): Learn about how files generated from Docusign workflows can be written to cloud storage in real time. - [File output system of record extension overview (beta)](https://developers.docusign.com/extension-apps/extension-apps-101/supported-extensions/file-output-system-of-record.md): Learn about how files generated from Docusign workflows can be written to a system of record in real time. - [Identify destination records (beta)](https://developers.docusign.com/extension-apps/extension-apps-101/supported-extensions/file-output-system-of-record/identify-destination-records.md): Review the options for identifying records to which files will be written. - [Identify the file source (beta)](https://developers.docusign.com/extension-apps/extension-apps-101/supported-extensions/file-output-system-of-record/identify-file-source.md): Review the options for the source of files to write to a system of record. - [Workflow configuration for file output scenarios (beta)](https://developers.docusign.com/extension-apps/extension-apps-101/supported-extensions/file-output-system-of-record/workflow-configuration.md): Review workflow configuration options for various file output scenarios. - [Extensions and actions (beta)](https://developers.docusign.com/extension-apps/extension-apps-101/supported-extensions/file-output-system-of-record/extensions-and-actions.md): Review the extensions and actions associated with file output to system of record. - [Plan an implementation (beta)](https://developers.docusign.com/extension-apps/extension-apps-101/supported-extensions/file-output-system-of-record/plan-implementation.md): Learn about important considerations when planning a file output to system of record implementation. - [File output tabular format extension overview](https://developers.docusign.com/extension-apps/extension-apps-101/supported-extensions/file-output-tabular-format.md)