Build a Production-Grade Accounts Payable Workflow

Many finance teams start with platforms like Bill.com for invoice management. These tools work well for standard single-approver workflows but break down when faced with complexity. For instance, an invoice over $5,000 might need approval from a department head, but only if it is for marketing spend and not if it is a recurring software subscription. Bill.com's rules engine cannot handle these nested, multi-variable conditions.

Consider a 20-person professional services firm. An invoice arrives from a new subcontractor for $7,500. The workflow should be: check if the PO number is valid in their project management tool, confirm the project manager approved the hours, then route it to the managing partner for sign-off. Point-and-click automation tools lack the ability to query the project management database directly to perform the PO validation. The AP clerk must manually check the other system, export a PDF, and email the partner for approval, which defeats the purpose of automation.

The structural problem is that off-the-shelf AP tools are built on a one-size-fits-all data model. They assume invoices have a fixed set of fields and approvals follow a linear path. Their architecture cannot incorporate external business logic, like checking a project budget before approving payment. This design prioritizes mass-market simplicity over the specific rules that allow a business to control costs effectively.

The result is a workflow filled with manual exceptions. This leads to late payments, missed early payment discounts, and hours of low-value work for the AP team chasing approvals. The lack of a central audit trail for these manual steps also creates compliance risks during financial reviews.

Syntora begins with a workflow audit. We map every step of your current AP process, from invoice receipt to final payment confirmation in your general ledger. This involves identifying every rule, exception, and approval threshold. The outcome is a detailed process diagram and a technical specification that you approve before any code is written.

The core of the system is a Python service built with FastAPI, which handles complex, stateful approval logic efficiently. For invoice ingestion, we use an OCR library to extract data from PDFs or connect directly to a dedicated email inbox via IMAP. All data is stored in a PostgreSQL database to create a permanent, auditable record of every action taken on an invoice.

The delivered system is a private API deployed on AWS Lambda, ensuring low operational costs, typically under $50 per month for moderate volumes. The system integrates with your existing accounting software, such as QuickBooks or Xero, to create bills and record payments automatically. You receive the full Python source code, a deployment runbook, and a simple dashboard to monitor invoice status and processing times, which are usually under 5 seconds per invoice.