> 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

# TGK Capital financial sample app

> This sample application showcases how a fictitious financial institution can use the Docusign iOS SDK to build a mobile application for their customers.

This sample application showcases how a fictitious financial institution can use the Docusign iOS SDK to build a mobile application for their customers. You can find the source code of this sample app on [GitHub](https://github.com/docusign/sample-app-tgk-financial-ios/).

The app demonstrates the following functionality:

* [Sending an offline envelope](/docs/mobile-sdks/ios-sdk/how-to/start-signing-offline)
* [Embedded signing](/docs/esign-rest-api/esign101/concepts/embedding) (captive signing)
* Setting recipient defaults
* [Offline signing](https://support.docusign.com/s/document-item?bundleId=gub1579795684748\&topicId=rxa1579795665285.html&_LANG=enus\&language=en_US\&rsc_301) and syncing
* [Authorization Code Grant](/platform/auth/authcode) authentication flow.  For more information, see [Authentication and login](/docs/mobile-sdks/ios-sdk/ios101/core-interfaces#authentication-and-login).

## Prerequisites for using the source code yourself

* iOS version 10 or above
* Xcode 12.4+
* Cocoapods