Automate Invoice Processing and Approvals with Custom AI

Many SMBs start with Bill.com or Tipalti for accounts payable. These platforms work well for paying standard invoices but their AI struggles with variation. When a key contractor sends an invoice from a new billing system, the automated data extraction fails, forcing your team back to manual entry. Their approval workflows are also rigid. They cannot handle a rule like 'If invoice is over $5,000 AND for the Marketing GL code, route to the CMO; otherwise, route to the department head.' You are forced to change your business process to fit the software.

Consider a 25-person services firm that works with dozens of freelancers. Each month, an operations person spends 15-20 hours collecting PDFs from emails, manually keying line items into QuickBooks, and chasing approvals. For a large invoice, they email the PDF to a manager, who emails it to a director. The chain of forwarded emails becomes the audit trail, which is slow and error-prone. The payment is often delayed, damaging vendor relationships.

QuickBooks Online's own bill-pay features offer little help. The system does not have an OCR engine to read PDF attachments, so every field from vendor name to line-item amount must be typed by hand. The tool is a digital payment form, not an intelligent intake system. You are still performing the highest-cost part of the process, data entry, manually.

The structural problem is that off-the-shelf AP tools are built for standardized workflows. They are multi-tenant platforms that must serve thousands of customers with a single, inflexible feature set. They cannot be adapted to your specific vendors, your chart of accounts, or your company's unique approval matrix. You need a system built for your process, not a process that works around a generic tool.

The first step is a discovery audit of your current AP process. Syntora analyzes a batch of 100-200 of your recent invoices to map every vendor, format, and data field. We document your exact approval matrix: who approves what, under which financial thresholds, and what the exception handling process looks like. This audit produces a clear plan for the automation engine.

Syntora has built financial automation systems connecting services like Plaid and Stripe to a custom PostgreSQL ledger. The approach for invoice processing uses a similar pattern. An AI model via the Claude API extracts structured data from unstructured PDFs and emails. This data is validated against Pydantic schemas to ensure accuracy. A FastAPI application contains the business logic for routing approvals via Slack or email. The entire system runs on AWS Lambda, typically costing under $50 per month for up to 10,000 invoices.

The delivered system monitors a dedicated email inbox like ap@yourcompany.com. When an invoice arrives, the system extracts the data, matches it to a purchase order, and sends a notification to the correct approver in Slack with 'Approve' and 'Reject' buttons. Once approved, the system creates a draft bill in your existing QuickBooks or Xero account, ready for payment. Your finance team only ever touches the exceptions, and a typical invoice is processed in under 60 seconds.