Heads up — Beta feature.Authorized apps and the PEX MCP Server are currently labeled Beta in the PEX dashboard. Behavior and field names may change.About the screenshots. The example uses a placeholder account. Your screen will show your own organization, agent name, and account data in the same positions.
What you will need before you start
- An admin account in the PEX dashboard:
https://dashboard.pexcard.com. - Two-factor authentication (MFA) enabled on your PEX account. Token generation requires MFA. Turn it on under Profile > Two-Factor Authentication if needed.
- A ChatGPT Plus, Pro, Team, or Enterprise plan. Free ChatGPT does not support custom connectors or agents.
- Developer access within ChatGPT. Custom MCP connectors require Developer mode, found under Settings → Security and login. On Team and Enterprise plans, your workspace administrator may need to grant this access.
Step 1. Navigate to the Agents page
Sign in to ChatGPT. In the left sidebar, click Agents.
Step 2. Create a new agent
ChatGPT opens the What should your agent do? screen. Skip the guided setup: click Start blank in the top-right corner of the screen.
Step 3. Configure the agent
On the agent configuration page, set the following:
Step 4. Generate an API token from the PEX dashboard
In a new browser tab, sign in to the PEX dashboard. Click your avatar in the top-right and choose your name to open your user profile.1
Open Authorized apps
Click the Authorized apps tab (marked Beta). PEX MCP Server appears in the list.
2
Open the MCP server config
Click MCP server config next to PEX MCP Server.
3
Complete MFA verification
Complete the MFA prompt. This is required every time you generate a token.
4
Generate and copy the token
Click Generate and copy the token immediately. The dashboard shows it only once.
Treat this token like a password.Anyone with the token can call PEX tools as you. If it is exposed, revoke it on this page and generate a new one.
Step 5. Enable Developer mode and add the PEX MCP Server as a connector
Back in ChatGPT, enable Developer mode, then add the PEX MCP Server as a connector.1
Open Settings
Click your profile picture in the top-right corner of ChatGPT, then click Settings.
2
Navigate to Security and login
In the Settings panel, click Security and login.
3
Enable Developer mode
Scroll to Developer mode and turn the toggle on. Accept the confirmation prompt.
4
Add the PEX MCP Server
Go to Settings → Connectors and click Add custom connector. Fill in the form:
5
Save the connector
Click Save. ChatGPT validates the connection. If the token is valid, the connector appears in your connectors list.
6
Add the connector to your agent
Saving a connector does not attach it to your agent. Return to the agent configuration page, click Browse apps, and select PEX MCP Server. Confirm it appears in the agent’s apps.
Common mistake.The header name is case-sensitive:
X-Pex-Api-Token. A wrong header name fails silently when the agent calls a tool.Don’t see Developer mode?Custom connectors require a paid ChatGPT plan. On Team and Enterprise plans, your workspace administrator may need to enable Developer mode for your account.
Step 6. (Optional) Upload PEX knowledge files
The MCP server gives the agent live access to your account data. It does not teach the agent how PEX works. To fill that gap, upload reference material with Upload files on the agent configuration page.
- PEX product guides or internal policy documents.
- A summary of your organization’s spending rules and approval workflows.
- Frequently asked questions specific to your team.
Tip:The MCP server answers “what is in my account right now.” Uploaded files answer “how does PEX work.” Together, the agent can look up a declined transaction and explain the relevant policy in one answer.
Step 7. Create and test the agent
Click Create in the top-right corner to save your agent. Then open a conversation with it and ask:What tools do you have access to?The agent should list the PEX MCP Server tools, including:
- Card tools — list cards, card orders, card spend rules, scheduled funding, load limits.
- Transaction tools — cardholder transactions, network transactions, transaction details, attachments.
- Business tools — business profile, admins, billing, linked accounts, one-time transfers.
- Spending rulesets — list rulesets, ruleset cards.
- Other — vendors, bills, payments, invoices, callback subscriptions, MCC categories, groups & cardholders.
What is my business profile?The agent calls
pex_get_business_profile and returns your Business Account ID, name, address, and contact info.
You can now ask questions like “list all my PEX cards”, “show transactions for card 1234 last week”, or “what spending rulesets do I have?”
Troubleshooting
The agent says it cannot see the PEX tools. Check Settings → Connectors to confirm the PEX MCP Server connector is listed and enabled. Then open the agent configuration, click Browse apps, and confirm PEX MCP Server is selected. Tool calls return 401 / Unauthorized. The token is invalid, expired, or has stray whitespace. Regenerate it in Authorized apps and update the connector. Tool calls return data from the wrong account. Tokens are scoped to the user who generated them. Generate the token under the correct PEX user. The header name field rejects what I typed. The header name must be exactlyX-Pex-Api-Token. Other casings do not work.
I don’t see the Authorized apps tab in the PEX dashboard.
The feature is in Beta. Contact PEX support to confirm your account is enabled.
I don’t see Developer mode in ChatGPT.
Custom connectors require a paid ChatGPT plan. On Team and Enterprise plans, your workspace administrator may need to allow Developer mode.
FAQ
Do I need special access to turn on Developer mode? On Team and Enterprise workspaces, yes. Your OpenAI workspace administrator must grant developer access. If the Developer mode toggle under Settings → Security and login is missing or disabled, ask your OpenAI admin to enable it before Step 5. Personal Plus and Pro accounts can turn on Developer mode directly. Does PEX support grant ChatGPT developer access? No. PEX support handles PEX-side issues such as API tokens. Developer access in ChatGPT is controlled by your OpenAI admin.Revoking access
To revoke an agent’s access to PEX:- Open the Authorized apps tab in the PEX dashboard.
- Revoke the token associated with PEX MCP Server.
- (Optional) Remove the PEX connector from ChatGPT under Settings → Connectors.
Need more help?
- For PEX-side issues (tokens, account access, MCP server availability), email
adminsupport@pexcard.com. - For ChatGPT issues (agents, connectors, Developer mode), see OpenAI’s help center.