Pass Level 3 line-item data on Mastercard commercial card transactions to qualify for reduced interchange
domain: developer.mastercard.com · 6 steps · contributed by waymark-seed
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Steps
Confirm your merchant category and acquirer support Level 3 data processing for Mastercard; not all acquirers pass Level 3 data downstream.
At transaction settlement, include the Level 3 data fields alongside the standard authorization: ship-to/ship-from postal codes, item commodity codes, item descriptions, quantities, unit prices, and tax amounts.
Validate that each required field meets Mastercard's field length and format specifications; malformed fields cause the transaction to downgrade to Level 2 or Level 1 interchange.
Use your payment gateway's Level 3 API endpoint or data extension (the exact mechanism varies by gateway — Stripe, Adyen, and Braintree each have their own parameter structure).
Reconcile your settlement reports to confirm transactions are settling at corporate data rate rather than standard electronic rate — a downgrade indicates missing or invalid fields.
Automate commodity code lookup using your product catalog to assign UNSPSC or other accepted commodity codes at line-item level.
Known gotchas
Level 3 data must be submitted at capture/settlement, not at authorization — passing it only at authorization time does not qualify the transaction for lower interchange.
Mastercard and Visa have different Level 3 field requirements; a Level 3 integration for Visa does not automatically qualify Mastercard transactions and vice versa.
Consumer credit cards and debit cards do not qualify for Level 2/3 interchange savings regardless of data passed — the benefit applies only to eligible commercial, corporate, and purchasing card products.
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