How to Reconcile Vendor Payments (AP) with Unified's Accounting API

The reconciliation of vendor payments using Unified's Accounting API emphasizes the importance of anchoring Accounts Payable (AP) processes in the general ledger rather than relying solely on payment events, which can lead to discrepancies when dealing with multiple providers. This approach involves treating bills as the authoritative source for what is owed, while transactions indicate what has been posted, thus ensuring accurate AP logic across different accounting systems. The guide outlines a method for reconciling AP by combining bills, transactions, contacts, and accounts, and matching payments using documented fields without guaranteed foreign keys. It highlights the need for defensive reconciliation practices, such as validating against AP accounts, and acknowledges the challenges posed by partial payments, vendor credits, and overpayments. By using Unified's Accounting API, teams can maintain clarity and accuracy in AP reconciliation, ensuring that bills remain the final authority on what is owed, while transactions capture payment activities.