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Add Firmable to ChatGPT so it can query Firmable data inside your conversations. Firmable is a verified ChatGPT app (ChatGPT calls these apps and plugins interchangeably), so the quickest way is to add it straight from the in-app store — no Client ID or developer setup required.

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Add from the ChatGPT store

1

Find Firmable

In ChatGPT, open Apps (also labelled Plugins) from the sidebar (under More if it’s not pinned), or go directly to chatgpt.com/plugins?q=firmable. Search for firmable, then click Firmable to open it.
2

Install the plugin

On the Firmable page, click Install plugin.
3

Sign in with Firmable

In the Add Firmable to ChatGPT dialog, click Sign in with Firmable.
4

Follow the prompts to finish

Follow the remaining prompts and click Allow to authorize access. Once connected, enable Firmable from the + → More menu in a chat to start using it.

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Add manually (custom connector)

Only needed if the Firmable app isn’t available in your ChatGPT plan. You’ll need the MCP URL and Client ID — see URL & Client ID.
1

Open Settings

In ChatGPT, click your profile at the bottom of the sidebar and choose Settings.
2

Open Apps → Advanced settings

Go to the Apps tab, then click Advanced settings.
3

Enable Developer mode and create an app

Turn on Developer mode (this is what lets you add an unverified custom connector), then click Create app.
4

Enter the Firmable MCP details

Fill in the New App form:
  • Name: anything you like — this guide uses Firmable
  • Description (optional): e.g. Firmable MCP connector
  • Connection: keep Server URL selected and enter the MCP URL (from URL & Client ID)
  • Authentication: OAuth
5

Configure OAuth and create

Expand Advanced OAuth settings and set the Registration method to User-Defined OAuth Client — this lets you use the Firmable credentials. Enter the Client ID (from URL & Client ID; leave the secret blank unless Firmable gives you one). If Firmable asks for a redirect/callback URL, copy the Callback URL shown here.Finally, tick I understand and want to continue to acknowledge that custom MCP servers aren’t reviewed by OpenAI, then click Create.
6

Sign in with Firmable

On the prompt, click Sign in with Firmable.
7

Authorize

Click Allow to grant ChatGPT access to Firmable.
8

Use it in a chat

Firmable is now connected. Choose when ChatGPT can use it, then enable Firmable from the + → More menu in a chat to start using it.