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Nuvei is a global payment provider that provides comprehensive payment processing solutions across multiple payment methods and regions. Klarna is a buy now, pay later (BNPL) payment method that lets buyers pay over time through a redirect approval flow.

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Setup

Please follow the common Nuvei instructions to get set up with Nuvei. After setting up your Nuvei account, ask Nuvei to complete the following Klarna-specific account configuration:
  1. Enable Klarna as a payment method on your merchant account.
  2. Enable sale mode for all Klarna transactions on your merchant account. Nuvei defaults Klarna to auth-settle mode, and Gr4vy supports only sale mode.

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Features

Nuvei Klarna payments support the following features:
  • Refunds - Refund transactions in full or in part
  • Partial refunds - Issue multiple partial refunds up to the captured amount
  • Transaction synchronization - Keep payment statuses synchronized with Nuvei
  • Redirect checkout - Redirect buyers to approve the payment

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Supported countries

Nuvei supports transactions from buyers in the following countries:
Country codeCountry codeCountry codeCountry codeCountry codeCountry code
ATBECHCZDEDK
ESFIFRGBGRHU
IEITNLNOPLPT
ROSESK

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Supported currencies

Nuvei supports processing payments in the following currencies:
Currency codeCurrency codeCurrency code
CHFCZKDKK
EURGBPNOK
PLNRONSEK

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Limitations

The following features are not supported by this connector:
  • Auth-settle mode - Klarna transactions require sale mode
  • Delayed capture - Authorization and capture must happen together
  • Partial capture - Cannot capture a portion of the authorized amount
  • Void - Cannot cancel transactions once initiated
  • Payment method tokenization - Cannot store payment methods for recurring transactions
  • Zero auth - Zero-dollar verification transactions are not supported
  • Settlement reporting - Settlement reporting is not available

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Integration

For Klarna, the default integration for Nuvei is through a redirect to a hosted payments page. Start by creating a new transaction with the following required fields. 
var transaction = await client.Transactions.CreateAsync(
  transactionCreate: new TransactionCreate()
  {
    Amount = 1299,
    Currency = "GBP",
    Country = "GB",
    PaymentMethod =
      TransactionCreatePaymentMethod.CreateCheckoutSessionWithUrlPaymentMethodCreate(
        new RedirectPaymentMethodCreate()
        {
          Method = "klarna",
          RedirectUrl = "https://example.com/callback",
        }
      ),
  }
);
After the transaction is created, the API response includes payment_method.approval_url and the buyer_approval_pending status. 
{
  "type": "transaction",
  "id": "ea1efdd0-20f9-44d9-9b0b-0a3d71e9b625",
  "payment_method": {
    "type": "payment-method",
    "approval_url": "https://cdn.sandbox.spider.gr4vy.app/connectors/nuvei/apm.html?token=..."
  },
  "method": "klarna"
}
Redirect the buyer to the approval_url so they can complete authentication and approve the payment. After approval the buyer is redirected to the redirect_url you provided when creating the transaction. Do not rely solely on the redirect - either poll the transaction or (recommended) rely on webhooks to detect the final status (for example capture_succeeded or failure states).

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Required fields

Nuvei requires the following fields to be collected during checkout for Klarna transactions:
  • First name and last name
  • Billing country
  • Email address