ChatGPT's available tools and write-action controls can vary. Your Cardzen plan and the access you approve determine what Cardzen permits.
Official ChatGPT plugin
Open Cardzen in ChatGPT. Select Install plugin there. If ChatGPT prompts you to connect an external service, continue with Cardzen sign-in and review the requested access. If the listing is unavailable to you, use the manual setup steps below.
Connect Cardzen
Install the official Cardzen plugin from its ChatGPT listing, then review access in Cardzen.
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Open Cardzen in ChatGPT.
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Select Install plugin. If ChatGPT asks, connect your Cardzen account as an external service.
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Sign in to Cardzen or create a Free account, finish setup, review the requested access, and approve only if you want to connect.
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Start a new chat and select the installed Cardzen plugin for your task.
ChatGPT account and workspace controls may limit availability.
Set up manually instead
Add Cardzen as a developer-mode app in ChatGPT using the Cardzen MCP address shown below, then approve access in Cardzen.
Cardzen MCP server address: https://mcp-stage.cardzen.ai/mcp
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Open Settings > Security and login, then turn on Developer mode.
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Open ChatGPT Plugins, select the plus button, and create a developer-mode app for a remote MCP server.
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Enter a name, description, and the Cardzen MCP address shown above. Choose OAuth and select CIMD if ChatGPT offers it for Cardzen.
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Complete Cardzen sign-in or create a Free account, finish setup, review access, and approve only if you want to connect.
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Review the discovered tools in the app details, refreshing there when you need updated tool information.
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In a new chat, choose Developer mode from the plus menu and select Cardzen.
Manual setup and Developer mode are required for this method; account and workspace controls may limit availability.
Try Cardzen after connecting
Use Cardzen to show the published restaurant rewards on cards in my wallet. Explain any limits or requirements, and don't change my cards or tracking.
If setup takes too long and the authorization request expires, your Cardzen account and completed setup remain saved. Return to the original ChatGPT tab or app and start the connection again; do not reuse the old authorization URL. If you skipped cards during setup, add them in Cardzen before asking about your wallet. Help and public catalog searches remain useful with an empty wallet.
For more about ChatGPT setup, see OpenAI's plugin installation guide and Developer mode guide.
Disconnect
You can disconnect from ChatGPT's app settings or revoke the Cardzen grant from Account & Settings -> Connections & MCP. Revoking in Cardzen prevents that grant from making another successful request.
See MCP Limits and Troubleshooting if authorization does not return to ChatGPT or the connection stops working.