Launching a marketplace: payments, regulation, and fund flows. 6 chapters and a final quiz.

Chapter 1. The marketplace model and why payments matter.

A marketplace connects buyers with third-party sellers and usually earns a commission on each transaction. A traditional online retailer sells its own inventory, whereas the platform collects money that doesn’t belong to it. The price the buyer pays is owed to the seller; only the commission goes to the platform. Users never see the difference, but it changes everything legally and technically, and it makes payments the first regulatory workstream in any marketplace project.

Chapter 2. Regulatory framework: license, exemption, or regulated partner.

PSD2 (Directive (EU) 2015/2366), transposed in France by Ordinance 2017-1252 of August 9, 2017, governs payment services under the French Monetary and Financial Code. A marketplace has three routes to compliance. It can obtain its own license as a payment institution (PI) or e-money institution (EMI) from the ACPR, or it can invoke the commercial agent exemption. Finally, it can partner with a regulated provider that collects and safeguards the funds on its behalf, the route chosen by the overwhelming majority of platforms.

Two structures dominate the partner route. The first is simple safeguarding: the provider (a PI or EMI) opens payment accounts or e-money wallets in the sellers’ names, then protects the funds in a safeguarding account under Article L. 522-17 of the French Monetary and Financial Code. If the provider goes bankrupt, users’ funds are ring-fenced from its estate. The second uses payment service agent status: the marketplace is registered with the ACPR (in the Regafi register) as its partner’s agent. It can then play a more active role in the payment flow, under the responsibility of its principal.

Chapter 3. Choosing a provider: Mangopay, Lemonway, Stripe Connect, Adyen.

Your choice of payment provider shapes everything: the payment methods you accept, how splits work, the quality of KYB, payout currencies, and the often-overlooked difficulty of a future migration. Four players dominate the European platform market. Two are long-standing specialists in the wallet model, Mangopay and Lemonway; two are payment giants that have built a platform offering, Stripe Connect and Adyen for Platforms.

Leading providers for marketplacesMangopayLELemonwayStripe ConnectAdyen for PlatformsPayPal

Chapter 4. KYB: onboarding sellers without hurting conversion.

KYB (Know Your Business) is the business equivalent of KYC. Before a seller can collect payments, the regulated provider must verify its identity, its structure, and its beneficial owners: the individuals who hold more than 25% of the capital or voting rights. The requirement comes from the EU AML/CFT directives and the French Monetary and Financial Code. For the marketplace, KYB matters in two ways. The marketplace owns the user experience of a regulatory obligation, and that flow is the first point of friction in its seller acquisition funnel.

• Legal entity: registration extract less than 3 months old (Kbis in France), signed articles of association, legal representative’s ID, beneficial ownership register, IBAN in the company’s name.
• Individual / sole proprietor (micro-entrepreneur): ID document, proof of registration (SIRET number), personal or business IBAN.
• Private individual (C2C): ID document and IBAN, with lighter thresholds. Full verification is often triggered once cumulative receipts pass a set level (risk-based approach).

Chapter 5. Money flows: safeguarding, escrow, and splits.

A marketplace’s flow architecture rests on three building blocks. At pay-in, the buyer pays and the funds arrive at the regulated provider. The split then divides the amount between the seller’s wallet and the platform’s commission wallet, before the pay-out sends the seller’s balance to its IBAN. In between, the funds sit in safeguarded wallets that never appear in the marketplace’s bank account, because the provider protects them in a dedicated safeguarding account.

{
  "payin_id": "payin_8842",
  "amount": { "value": 10000, "currency": "EUR" },
  "transfers": [
    {
      "credited_wallet": "wallet_seller_512",
      "amount": { "value": 8500, "currency": "EUR" },
      "label": "Sale, order #20260711-042"
    },
    {
      "credited_wallet": "wallet_platform_commission",
      "amount": { "value": 1500, "currency": "EUR" },
      "label": "15% commission"
    }
  ],
  "payout_policy": { "schedule": "D+7", "rolling_reserve_pct": 0 }
}

Reconciliation is the hidden workstream in marketplace flows. Every order must be matched to its pay-in, its transfers, any refunds, and its payout. A multi-seller cart complicates the equation, with one pay-in, N splits, and N payouts, and partial refunds and disputes that arrive after payout add further weight. From day one, plan for an order ID carried through every payment object, plus an automated daily reconciliation between your back office and the provider’s reports.

Chapter 6. Disputes, DAC7, and go-live.

A marketplace inherits the disputes of all its sellers. When a buyer disputes a card payment (a chargeback), the claim travels from the buyer’s issuing bank to the acquirer used by the platform’s provider, and the funds are clawed back. The wallet architecture then determines who absorbs the loss. Best practice is to debit the seller’s wallet and cover the risk of an insufficient balance with the reserve or an offset against future sales. Otherwise, the platform pays.

On the tax side, the DAC7 directive (EU 2021/514, in effect since January 1, 2023) requires platform operators to report their sellers’ income to the tax authorities every year. The report covers identity, tax ID number, IBAN, amounts collected, and commissions by quarter. In France, it is filed with the DGFiP by January 31 for the previous year. The data is then exchanged between member states. Occasional sellers of goods are excluded under a double threshold: fewer than 30 sales and €2,000 or less a year.

• Seller activation rate: share of sign-ups that reach verified KYB status (target > 70% for professional sellers).
• Median payout time: from sale to funds received; when it slips, it’s the leading cause of seller churn.
• Dispute rate: chargebacks ÷ transactions, monitored by category and by seller (card network monitoring programs kick in at 1.5%, with fraud included at Visa).
• Reconciliation gap: amounts left unmatched at the end of the day (target: zero; temporary tolerance < 0.1% of volume).
• DAC7 completeness: share of active sellers with a complete reporting file (target 100% before December 31).