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# How does invoice payment work for FBA/WFS and DTC?

Billing depends on the service line.

Amazon FBA and Walmart WFS

- Invoices are issued on the first of the month.
- For a new account, the first invoice is normally issued after the first two shipments.
- The monthly minimum is 500 units. Starting November 1, 2026, if fewer than 500 units ship in a month, the shortfall is billed at $0.75 per unit, for a $375 monthly minimum.

DTC and multi-channel fulfillment

- Billing is issued twice per month through the billing profile created during onboarding.
- A $300 monthly minimum applies to pick-and-pack, additional picks, and storage. Shipping and supplies do not count toward that minimum.

Your invoice or billing profile contains the available payment instructions. Your signed quote and warehousing agreement control any custom rates, payment method, or billing cadence. If an invoice looks incorrect, contact PrepFort before the due date.