Level 2 data for B2B — passing tax and PO through USAePay

Question

B2B, mostly Visa/MC commercial cards. Want to qualify for Level 2 interchange. Which fields do I send?

Gateway Nerds Team · Accepted Answer

Level 2 for USAePay REST v2 needs three fields on the sale:

{
  "command": "sale",
  "amount": "523.10",
  "invoice": "INV-4471",
  "ponum": "PO-2026-118",
  "tax": "38.10",
  "tax_exempt": false
}

Key things:

ponum must be a real customer PO (or your invoice number if PO isn't provided). Cannot be blank on commercial cards.
tax in dollars, not cents. If genuinely tax-exempt set tax_exempt: true and tax: 0.
Card must be a commercial / purchasing card — Level 2 doesn't apply to consumer cards, so you'll only see the savings on B2B customers' cards.

Level 3 needs line items on top of this — worth the effort if your average ticket is >$500 and you have real purchasing-card volume.

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