Understanding your customer's invoice approval workflow is essential for collecting from large organizations. Most corporations require invoices to be matched against a purchase order. An invoice with an incorrect or missing PO number can sit in an exception queue indefinitely. Before invoicing a corporate client for the first time, ask: "What PO number should I reference, and who in your AP department should receive the invoice?" Getting that right at the start prevents payment delays from day one.

Approval workflows also create payment timing patterns. Many large companies run a weekly or bi-weekly payment cycle, where approved invoices are batched and paid on a fixed day regardless of individual due dates. An invoice approved two days after the weekly payment run waits until the next cycle. Knowing your customer's payment run schedule lets you focus on getting invoices approved before the cutoff rather than chasing them after the due date.

When an invoice is stuck in a customer's approval workflow, the right contact isn't the person who hired you. It's the accounts payable team. Call AP directly, provide your invoice number, reference the PO, and ask where it is in the approval process. Most AP departments will tell you the approval status honestly and can identify the specific approver holding the invoice. This targeted approach unsticks invoices far faster than escalating to the original buyer.