To ensure a robust, seamless, and customer-friendly Klarna integration through Adyen, it is essential to follow a set of best practices. This checklist will help you finalize your Klarna setup using Adyen APIs and prepare for go-live with full functionality and compliance

• Address & phone validation
  • Make sure to validate all addresses and phone numbers before sharing them with Adyen. Rejections due to mismatched or incorrect addresses late in the process can have a negative impact on acceptance rates, so ensuring these are correct early on is critical.

• Tax handling with discounts
  • You need to declare the tax amounts and VAT for your Klarna orders. It’s crucial to declare discounts and taxes correctly. Make sure to follow the invoice lines and discounts guidance in Adyen Docs to avoid integration issues.

• Extra merchant data (EMD)
  • Extra merchant data is a set of additional information typically unavailable during the checkout flow. This information may consist of data about the customer performing the transaction, the products or services associated with the transaction, or the seller and their affiliates. Depending on the business category or the type of goods you sell, sending EMD data may be a mandatory requirement.
  • Here are some examples of business categories where sending EMD is mandatory:
    • Travel (flight, train, bus, car rental, hotel)
    • Marketplaces
    • Tickets and events
    • Subscriptions
    • Vouchers and gift cards

• Product and image URLs
  • You can share the imageUrl and the productUrl with Adyen. This lets Klarna use these resources in your communication with the customer to improve the post-purchase experience in the Klarna app. This helps the end customer to visualize the purchase they have made.

• Set up branding in the Klarna Partner Portal
  • Upload your logo and brand name.
  • Ensure the assets meet Klarna’s format and resolution requirements.
  • Benefit: Klarna will reflect your brand across touch points with the consumer, improving recognition and trust.