The short answer
Level II requires tax amount and customer code. Level III adds line-item detail: product codes, descriptions, quantities, unit prices and freight. Commercial, corporate and purchasing cards qualify for materially lower interchange when this data is transmitted — up to about 1.00% on Level III.
Why so few merchants use it
It requires gateway configuration and, for Level III, structured line-item data from your invoicing or ERP system. Most providers never mention it because the setup work sits with them.
Who benefits most
Wholesalers, distributors, professional services, government suppliers and anyone regularly invoicing other businesses. On $500,000 monthly B2B volume, 0.60% saved is $36,000 a year.
Key takeaways
- Level II is easy; Level III needs line-item data
- Only commercial and purchasing cards qualify
- Frequently worth more than any rate negotiation
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