pay_invoice · Ontraport MCP Server MCP: Risk & Policy

WHAT IT DOES

What pay_invoice does on Ontraport MCP Server

AI agents use pay_invoice to commit financial operations through Ontraport MCP Server — usually the final step of a payment, billing, or trading workflow. A call moves real money.

WHY IT NEEDS A POLICY

Why pay_invoice needs a policy

This tool directly initiates a financial transaction by charging a payment card on file. It moves money and commits financial obligations, making it clearly a Financial category tool. The critical severity reflects that misuse could result in unauthorized charges to customers' payment methods, with high financial and reputational impact.

From the tool's definition Pay an existing unpaid invoice using a card on file. This charges the contact

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

pay_invoice Approval-gated

Any call to pay_invoice is blocked until a human approves it. The rest of the server keeps working.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "pay_invoice": {
      "deny_if": [
        {
          "conditions": [],
          "on_deny": "Requires human approval."
        }
      ]
    }
  }
}

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Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches Ontraport MCP Server, so you can run agents against it safely.

FAQ

Questions about pay_invoice

What does the pay_invoice tool do? +

Pay an existing unpaid invoice using a card on file. This charges the contact. It is categorised as a Financial tool in the Ontraport MCP Server MCP Server, which means it involves financial transactions. Block by default and require explicit approval.

How do I enforce a policy on pay_invoice? +

Register the Ontraport MCP Server MCP server in PolicyLayer and add a rule for pay_invoice: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches Ontraport MCP Server. Nothing to install.

What risk level is pay_invoice? +

pay_invoice is a Financial tool with critical risk. Critical-risk tools should be blocked by default and only enabled with explicit human approval.

Can I rate-limit pay_invoice? +

Yes. Add a rate_limit block to the pay_invoice rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.

How do I block pay_invoice completely? +

Set action: deny in the PolicyLayer policy for pay_invoice. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.

What MCP server provides pay_invoice? +

pay_invoice is provided by the Ontraport MCP Server MCP server (landonray/mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.