Vendor Payment Validation with Compliance Checks

The problem

Invoices routed for payment are evaluated before disbursement. Corules checks: vendor against approved list, invoice against open PO, duplicate detection against recent payments, and amount against authority limits. Non-approved vendors or mismatched invoices escalate. Every payment decision is logged with policy version for SOX audit.

Without deterministic enforcement, AI agents either block every edge case (adding manual overhead) or silently approve decisions that violate policy — with no audit trail to show auditors or regulators.

How Corules solves it

Corules sits between your AI agent and the action it wants to take. When the agent proposes a decision, Corules evaluates the full context against your compiled policy set in a single deterministic pass — no LLM, no ambiguity.

The result is a structured outcome: BLOCK — vendor_id 'VND-9921' not in approved_vendors list. Payment blocked pending vendor approval.

Policy example

Corules policies are written in CEL (Common Expression Language). They are compiled once at publish time and evaluated deterministically at request time — no LLM, no variability.

// Vendor payment policy (CEL)
context.vendor_id in params.approved_vendors
  && !context.is_duplicate_invoice
  && context.invoice_amount <= context.po_amount * 1.05
  && context.payment_amount <= params.authority_limits[context.approver_role]

This expression is evaluated against the structured context your agent sends in the /v1/validate request.

Integration options

Corules integrates with the tools your teams already use. All integrations call the same REST API or MCP server — your policy logic stays in one place.

Frequently Asked Questions