Charge an invoice via offline payment (cash/check/wire). POST /invoices/{invoiceId}/charge with paymentType: offlinePaymentProvider. AMOUNT IN CENTS: e.g. 5500 = $55.00. Required: invoiceId, amount (integer cents).
AI agents use charge_invoice_external to commit financial operations through Rebillia MCP Server — usually the final step of a payment, billing, or trading workflow. A call moves real money.
This tool moves money by charging customers for invoices through offline payment methods. It commits financial obligations and represents a critical financial operation. Even though it processes offline payments, it records and executes charges in a billing system, making it categorically Financial.
From the tool's definition Tool charges an invoice by processing an offline payment (cash/check/wire). Description explicitly states 'Charge an invoice' and specifies amount in cents, confirming monetary transaction processing.
Attacks that exploit this kind of access
Charge an invoice via offline payment (cash/check/wire). POST /invoices/{invoiceId}/charge with paymentType: offlinePaymentProvider. AMOUNT IN CENTS: e.g. 5500 = $55.00. Required: invoiceId, amount (integer cents). It is categorised as a Financial tool in the Rebillia MCP Server MCP Server, which means it involves financial transactions. Block by default and require explicit approval.
Register the Rebillia MCP Server MCP server in PolicyLayer and add a rule for charge_invoice_external: 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 Rebillia MCP Server. Nothing to install.
charge_invoice_external is a Financial tool with critical risk. Critical-risk tools should be blocked by default and only enabled with explicit human approval.
Yes. Add a rate_limit block to the charge_invoice_external 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.
Set action: deny in the PolicyLayer policy for charge_invoice_external. 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.
charge_invoice_external is provided by the Rebillia MCP Server MCP server (rhinosaas/rebillia-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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