// MCP TOOL REFERENCE

verify_payment_method

ServerMcp Ap2
CategoryFinancial

WHAT IT DOES

What verify_payment_method does on Mcp Ap2

AI agents use verify_payment_method to commit financial operations through Mcp Ap2 — usually the final step of a payment, billing, or trading workflow. A call moves real money.

THE RISK

Critical Risk

Why verify_payment_method needs a policy

This tool initiates a financial transaction — either a zero-auth or a $1 authorization charge — against a real payment method. Even though it's described as a verification step, it directly interacts with payment processors and can result in a real $1 charge or a card authorization hold, constituting a financial operation. Misuse could trigger unauthorized charges or card holds across many payment methods at scale.

From the tool's definition Run a credit-card verification (zero-auth or $1 auth) on a tokenized payment method via verifyPaymentMethod

Documented attack patterns abuse exactly the kind of access verify_payment_method gives an agent:

POLICY

How to control verify_payment_method

PolicyLayer is an MCP gateway — it sits between your AI agents and Mcp Ap2, and nothing reaches the server without passing your rules. This is the rule we recommend for verify_payment_method:

policy.json

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

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

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Point your MCP client (Claude, Cursor, anything) at your gateway URL.

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EXPLORE

Related tools and policies

More Mcp Ap2 tools

Financial authorize_transaction Authorize a transaction (reserve funds without capturing) via Braintree GraphQL authorizeP Financial block_card Block a card temporarily (reversible). Use for lost-card or fraud-suspected flows. Card st Financial cancel_bill Cancel a pending bill Financial cancel_collection Cancel a scheduled collection request Financial cancel_credit Cancel an authorized-but-uncaptured credit payment. Financial cancel_debit Cancel a debit-card payment by Getnet payment_id. Financial cancel_invoice Cancel/void an authorized invoice (FECancel — limited to certain types/conditions) Financial cancel_order Cancel an order, optionally restocking and refunding

All 1300 Mcp Ap2 tools →

Financial tools on other servers

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Go deeper

Critical-risk tools in Mcp Ap2 → Every critical-risk tool this server exposes, in one view.
All critical-risk MCP tools → Every critical-risk tool across the catalogue, and the policy pattern that contains them.
The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Human-in-the-loop → When a tool call should wait for a person — and when policy can decide alone.
Tool call approval → Approval gates on individual tool calls: auto-allow, prompt, or deny.
How to Add Spending Controls to Any MCP Agent →
Rate Limiting MCP Tool Calls: A Practical Guide →

FAQ

Questions about verify_payment_method

What does the verify_payment_method tool do? +

Run a credit-card verification (zero-auth or $1 auth) on a tokenized payment method via verifyPaymentMethod. Returns a CreditCardVerification with status and processor response. Useful before vaulting or charging. It is categorised as a Financial tool in the Mcp Ap2 MCP Server, which means it involves financial transactions. Block by default and require explicit approval.

How do I enforce a policy on verify_payment_method? +

Register the Mcp Ap2 MCP server in PolicyLayer and add a rule for verify_payment_method: 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 Mcp Ap2. Nothing to install.

What risk level is verify_payment_method? +

verify_payment_method 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 verify_payment_method? +

Yes. Add a rate_limit block to the verify_payment_method 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 verify_payment_method completely? +

Set action: deny in the PolicyLayer policy for verify_payment_method. 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 verify_payment_method? +

verify_payment_method is provided by the Mcp Ap2 MCP server (@codespar/mcp-ap2). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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