# ChatGPT

You can connect BoldSign to ChatGPT if you have a Pro, Plus, Business, Enterprise, or Education account. For the current ChatGPT **New App** flow, use **OAuth** with your BoldSign MCP endpoint.

## Before you begin

- Choose the hosted MCP endpoint from {% customlink href="/boldsign-mcp-server/overview/#production-regional-endpoints" text="Regional Endpoints" /%} that matches your BoldSign account region
- Review {% customlink href="/boldsign-mcp-server/authentication/" text="Authentication" /%} before you start, because the ChatGPT setup path for an authenticated BoldSign MCP connection uses OAuth
- Confirm that ChatGPT Developer mode is available in your environment.
- Create or update a BoldSign OAuth application in the same region as your MCP endpoint

## Supported Authentication in ChatGPT

- OAuth is the supported authentication path for this ChatGPT setup.
- ChatGPT does not provide a place to enter the `X-API-Key` header used by some other MCP clients.
- Use API key authentication only in clients that support custom headers. For BoldSign, that includes flows such as {% customlink href="/boldsign-mcp-server/claude/" text="Claude Code" /%} and {% customlink href="/boldsign-mcp-server/github-copilot/" text="GitHub Copilot" /%}, not this ChatGPT setup path.

When you add BoldSign as a ChatGPT app, ChatGPT handles the OAuth redirect and token exchange. Your job is to supply the BoldSign MCP endpoint, enter your BoldSign OAuth client details, register the ChatGPT callback URL in your BoldSign OAuth application, and complete the sign-in flow ChatGPT presents.

## Create the app in ChatGPT

1. In ChatGPT, open **Settings -> Apps -> Advanced settings** and enable **Developer mode** if your environment requires it.
2. Return to **Settings -> Apps** and click **Create app**.
3. In the **New App** dialog, enter the basic app details:
    - **Name** - `BoldSign MCP`
    - **Description** - optional, for example `Connects ChatGPT to live BoldSign documents, templates, contacts, users, and teams`
    - **MCP Server URL** - the BoldSign MCP endpoint from Overview that matches your region
    - **Authentication** - `OAuth`
4. Open **Advanced OAuth settings**.
5. In **Client registration**, keep the registration method set to **User-Defined OAuth Client**.
6. Copy the **Callback URL** shown by ChatGPT and add that exact URL to your BoldSign OAuth application in the same region as your MCP endpoint.
7. Enter your **OAuth Client ID** from the BoldSign OAuth application.
8. Enter **OAuth Client Secret** only if your BoldSign OAuth configuration uses one for this flow.
9. Keep **Token endpoint auth method** set to `none` if ChatGPT shows that value for your BoldSign app setup.
10. Review the custom MCP server risk message and select **I understand and want to continue**.
11. Save the app and complete the OAuth sign-in flow ChatGPT presents.
12. Start a new chat, choose **Developer mode**, and enable the BoldSign app for that conversation.

## Notes

ChatGPT may show notices that **DCR is unavailable** and **CIMD is unavailable** for this setup. For the current BoldSign flow shown here, continue with **User-Defined OAuth Client**.