# How four merchants sold through one firma.de checkout without breaking payments or compliance.

> A single purchase flow across four legal entities, with each seller charging correctly while customers checked out once.

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CASE STUDY · FIRMA.DE

SITUATION

firma.de, Germany's largest company formation platform, sells services from several legal entities, and no merchant may charge on behalf of another. The customer still expects one basket and one payment.

WHAT I BUILT

- Single-flow checkout, from basket through suggestions, summary, and billing to payment.
- Each seller charges through its own payment account, with its own invoices and terms.
- Five money buckets per order; every subscription renewal creates its own order and invoice.
- Concierge mode: agents complete a prepared basket together with the customer.
- Admin catalogue for products, packages, and upsell suggestions.

4

sellers, one basket

−70%

partner onboarding time

1

payment for the customer

Four sellers, one basket: pay-now and pay-later per merchant, totals split by billing rhythm. Partner onboarding time fell 70% once white-label flows were wired into every stage.

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