// MCP TOOL REFERENCE

webpay_capture_transaction

Deferred-capture for a previously authorized Webpay Plus transaction. Uses the official PUT /capture endpoint — prefer this over webpay_increase_amount for standard deferred-capture flows.

ServerMcp Afip
CategoryFinancial

How to control webpay_capture_transaction ↓

WHAT IT DOES

What webpay_capture_transaction does on Mcp Afip

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

THE RISK

Critical Risk

Why webpay_capture_transaction needs a policy

This tool captures (finalizes) a previously authorized payment transaction, which constitutes committing a financial obligation. Once captured, funds are collected from the customer's account. This is a financial operation with critical blast radius if misused, as it triggers actual monetary movement.

From the tool's definition Deferred-capture for a previously authorized Webpay Plus transaction... PUT /capture endpoint

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

POLICY

How to control webpay_capture_transaction

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

policy.json

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

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

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EXPLORE

Related tools and policies

More Mcp Afip tools

Financial authorize_transaction Authorize a transaction (reserve funds without capturing) via Braintree GraphQL authorizeP Financial cancel_collection Cancel a scheduled collection request Financial cancel_credit Cancel an authorized-but-uncaptured credit payment. Financial cancel_payment Attempt to cancel a payment that has not yet settled. Iniciador endpoint: POST /payments/{ Financial cancel_payment_intent Cancel a payment intent that has not yet been captured. Fails on already-captured intents; Financial cancel_recurrence Cancel an active recurrence. Future charges will stop; already-charged cycles are untouche Financial cancel_subscription Cancel a subscription by ID Financial revoke_token Revoke an issued access_token or refresh_token at POST /v1/token/revoke. Use to terminate

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Go deeper

Critical-risk tools in Mcp Afip → 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 webpay_capture_transaction

What does the webpay_capture_transaction tool do? +

Deferred-capture for a previously authorized Webpay Plus transaction. Uses the official PUT /capture endpoint — prefer this over webpay_increase_amount for standard deferred-capture flows. It is categorised as a Financial tool in the Mcp Afip MCP Server, which means it involves financial transactions. Block by default and require explicit approval.

How do I enforce a policy on webpay_capture_transaction? +

Register the Mcp Afip MCP server in PolicyLayer and add a rule for webpay_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 Afip. Nothing to install.

What risk level is webpay_capture_transaction? +

webpay_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 webpay_capture_transaction? +

Yes. Add a rate_limit block to the webpay_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 webpay_capture_transaction completely? +

Set action: deny in the PolicyLayer policy for webpay_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 webpay_capture_transaction? +

webpay_capture_transaction is provided by the Mcp Afip MCP server (codespar/mcp-dev-latam). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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