// MCP TOOL REFERENCE

capture_transaction

Capture a previously authorized transaction via captureTransaction. Amount defaults to full authorized amount when omitted (partial captures allowed up to the authorized total).

ServerMcp Ap2
CategoryFinancial

How to control capture_transaction ↓

WHAT IT DOES

What capture_transaction does on Mcp Ap2

AI agents use capture_transaction 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 capture_transaction needs a policy

Capturing a transaction is a financial operation that completes a payment by transferring funds from the authorization hold. This directly moves money and constitutes a financial commitment. Misuse by an AI agent could result in unauthorized or incorrect charges being finalized, making it critical severity.

From the tool's definition 'Capture a previously authorized transaction via captureTransaction' and 'partial captures allowed up to the authorized total' — this tool finalizes a financial transaction, moving money by capturing authorized funds.

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

POLICY

How to control capture_transaction

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 capture_transaction:

policy.json

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

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

Create a free account and register Mcp Ap2 — nothing to install.
Add this policy — paste it, or build it visually.
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 capture_transaction

What does the capture_transaction tool do? +

Capture a previously authorized transaction via captureTransaction. Amount defaults to full authorized amount when omitted (partial captures allowed up to the authorized total). 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 capture_transaction? +

Register the Mcp Ap2 MCP server in PolicyLayer and add a rule for capture_transaction: 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 capture_transaction? +

capture_transaction 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 capture_transaction? +

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

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

capture_transaction 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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