Case notes: solving level 2 and level 3 processing for a merchant

The situation, in general terms

These case notes describe how we approach level 2 and level 3 processing, drawn from the pattern we see rather than any one named merchant. Picture a B2B seller whose customers pay large invoices with corporate cards. The transactions go through fine, but the effective rate feels high, and no one on the team can say exactly why. That is the recurring situation this kind of work starts from.

We are deliberately keeping this illustrative. The point is the method, not a scoreboard of results.

What are level 2 and level 3 processing?

Level 1 is a basic transaction: the amount, the card, the date. Level 2 adds fields such as tax amount and a customer or purchase-order reference. Level 3 goes further with line-item detail: item descriptions, quantities, unit prices, and freight. Commercial, corporate, and government cards can qualify for lower interchange when this richer data is submitted.

The reason the networks reward it is that more data means lower fraud risk and better reporting for the card issuer. In practice, it means a B2B merchant sending the extra fields may pay less interchange on exactly the cards their customers use most.

How we diagnose the gap

Our first step is to look at the card mix. If a meaningful share of volume is commercial or corporate cards but the integration only sends Level 1 data, that is the gap. We check what fields the current setup captures at checkout and what it forwards to the processor, because enhanced data only helps if it is actually transmitted, not just collected.

We also confirm the merchant can produce the line-item detail Level 3 needs. If the invoicing system already has quantities and unit prices, the data exists; it just is not flowing to the payment.

How we set up level 2 and level 3 processing

The approach is to capture the required fields at the point of payment and pass them through on the transaction. With Flux's REST API and hosted fields, a merchant can submit the tax, purchase-order, and line-item data alongside the charge, so eligible commercial-card transactions are presented with the enhanced detail the networks look for.

We pair that with tokenization and webhooks so the merchant is not re-entering data or manually checking status. The goal is that enhanced data becomes automatic on every qualifying transaction, not a field someone has to remember to fill.

What we are careful not to promise

We do not quote a guaranteed savings figure, because the actual interchange difference depends on the card, the transaction, and network rules we do not control. What we can say honestly is that submitting Level 2 and Level 3 data on commercial cards is a recognized way to qualify for lower interchange, and that a B2B merchant with corporate-card volume is exactly who benefits.

Overpromising a number would be the wrong way to earn trust in payments, so we describe the mechanism and let the merchant's own volume tell the story.

The takeaway from these notes

The pattern is consistent: find the commercial-card volume, confirm the data exists, and make sure it flows through on every eligible transaction. If your business bills other businesses on corporate cards and you suspect you are leaving interchange savings on the table, we are happy to look at your setup.

Reach Flux at sales@fluxpayments.com or (813) 402-8244.