Shopify's B2B checkout includes a purchase order field, but cannot make it required or check the format buyers enter. PO Number Validator adds that control. Set your rules once, and every B2B buyer must enter a PO number matching your format before placing an order. Validation runs server-side, so it applies to every checkout type. When a PO is missing or incorrect, buyers see a clear message explaining what to fix, so orders arrive correct and ready for your accounts payable team.

• Require a purchase order number on every B2B checkout
• Enforce PO format with pattern, prefix, and length rules
• Works on all checkout types, including express and accelerated
• Show buyers translated error messages for each market you sell in
• Apply built-in PO format presets for SAP and US Government orders