Open Banking in Germany 2026: finAPI vs Tink vs Klarna Kosma

Definition

Open banking providers in Germany aggregate bank account data (AIS) and initiate payments (PIS) through regulated APIs, replacing manual bank logins and EBICS file uploads. The three dominant platforms for German B2B use in 2026 are finAPI (Hamburg), Tink (Visa-owned, Stockholm), and Klarna Kosma (Berlin, formerly Billogram/banking arm).

Why Provider Choice Matters

Switching open banking providers later costs 3–6 months of re-integration. Bank connections require user re-authentication (90-day consent expiry under PSD2). Payment initiation workflows embed provider-specific error handling. Choose based on your bank mix, use case priority, and expansion plans.

Quick Comparison

finAPI: The German Mittelstand Default

finAPI (owned by Finastra) built its business on German FinTS and HBCI integrations before PSD2 existed. That history shows in Sparkasse and Volksbanken reliability: historically the hardest banks to connect.

Strengths

• Deepest German bank coverage including cooperative banks
• Strong business account support (not just retail)
• Transaction categorization tuned for German merchants
• BaFin-licensed, DORA-compliant
• Good documentation in German

Weaknesses

• Less polished developer experience than Tink
• Pan-European expansion less seamless
• Pricing not transparent (enterprise sales)

Integration Example

// finAPI: Create bank connection
const response = await fetch('https://live.finapi.io/api/v2/bankConnections/import', {
  method: 'POST',
  headers: {
    'Authorization': `Bearer ${userToken}`,
    'Content-Type': 'application/json'
  },
  body: JSON.stringify({
    bankId: 280001, // Deutsche Bank
    bankingInterface: 'XS2A',
    loginCredentials: {
      userId: 'user123',
      pin: 'encrypted_pin'
    }
  })
});

const connection = await response.json();
// Poll for transaction import
const transactions = await fetch(
  `https://live.finapi.io/api/v2/transactions?accountIds=${connection.accountIds}&minBankBookingDate=2026-01-01`,
  { headers: { 'Authorization': `Bearer ${userToken}` } }
);

Best For

German Mittelstand with 3+ domestic bank accounts, treasury visibility priority, DATEV reconciliation.

Tink: Pan-European Scale

Visa acquired Tink in 2022. Tink offers the broadest EU bank coverage with the most polished API and developer tools.

Strengths

• 6,000+ banks across 18 European markets
• Best developer experience (SDKs, sandbox, docs)
• Payment Request API for one-click checkout
• Strong categorization ML model
• Variable Recurring Payments (VRP) support

Weaknesses

• German cooperative bank connections occasionally lag finAPI
• Enterprise pricing (Visa premium)
• Less German-language support infrastructure

Integration Example

// Tink: Generate authorization link
const authUrl = await tinkClient.authorizationLinks.create({
  user_id: userId,
  scope: 'accounts:read,transactions:read,payments:write',
  market: 'DE',
  locale: 'de_DE',
  redirect_uri: 'https://app.company.de/callback'
});
// Redirect user to authUrl.url for bank consent

// After callback, fetch accounts
const accounts = await tinkClient.accounts.list({ user_id: userId });

Best For

Companies expanding beyond Germany, neobanks, fintech products needing pan-EU coverage.

Klarna Kosma: Payment-Initiation-First

Klarna Kosma (rebranded from internal banking infrastructure) focuses on payment initiation and account verification, leveraging Klarna's merchant network.

Strengths

• Strong PIS with Klarna's payment routing
• Account verification (IBAN/name check)
• Competitive pricing for payment initiation volume
• Berlin-based, German-speaking support
• Good for e-commerce + B2B hybrid

Weaknesses

• AIS less mature than finAPI/Tink
• Smaller bank network for business accounts
• Less proven for treasury use cases
• Product still evolving post-rebrand

Integration Example

// Klarna Kosma: Initiate payment
const payment = await kosmaClient.payments.create({
  amount: { value: 150000, currency: 'EUR' },
  creditor: {
    name: 'Lieferant GmbH',
    account: { iban: 'DE89370400440532013000' }
  },
  debtor_account_id: connectedAccountId,
  reference: 'RE-2026-0042',
  execution_date: '2026-06-15'
});

Best For

Companies prioritizing supplier payment automation over cash visibility, especially if already in Klarna ecosystem.

Feature Deep Dive

Account Information (AIS)

Payment Initiation (PIS)

Verification of Payee (VOP)

All three providers implemented VOP through 2026. This is critical for PSD3 readiness:

// Example VOP check before payment
const vopResult = await provider.verifyPayee({
  iban: 'DE89370400440532013000',
  name: 'Müller GmbH'
});

switch (vopResult.matchCode) {
  case 'MATCH': proceedWithPayment(); break;
  case 'CLOSE_MATCH': showSuggestedName(vopResult.suggestedName); break;
  case 'NO_MATCH': requireManualApproval(); break;
  case 'NOT_POSSIBLE': proceedWithWarning(); break;
}

Pricing Models

None publish transparent pricing. Based on 2026 market rates:

Volume discounts apply above 1,000 accounts or 10,000 payments/month.

Decision Framework

Primary use case?
├── Treasury visibility → finAPI (DE banks) or Tink (EU-wide)
├── Supplier payments → Klarna Kosma or finAPI
├── Customer onboarding (IBAN verify) → Klarna Kosma
└── Product embedding (fintech) → Tink

Bank mix?
├── 3+ German banks incl. Sparkasse → finAPI
├── EU-wide operations → Tink
└── 1-2 major banks (DB, CB) → Any provider

Budget?
├── under €2K/month → Klarna Kosma
├── €2-5K/month → finAPI
└── over €5K/month → Tink (negotiate)

Migration Considerations

If switching providers:

1. Plan for 90-day user re-authentication cycle
2. Map transaction category codes between providers
3. Rebuild payment initiation error handling
4. Run parallel feeds for one month during transition
5. Update DATEV reconciliation matching rules

Business Outcomes

Selecting the right provider eliminates manual bank login (saving 5–10 hours/week for finance teams), enables daily automated reconciliation, and prepares infrastructure for PSD3 payment initiation requirements.

Related: PSD3 for German CFOs · Open Banking APIs Explained