Choosing the right payment infrastructure is one of the most consequential decisions a small business in Sweden makes. The wrong setup drains margins through hidden fees. The right one scales with your sales channels without demanding engineering resources. This guide compares four providers — Klarna, Adyen, Stripe, and Zettle — across the criteria that actually matter to small businesses: pricing transparency, integration complexity, payout speed, and which sales channels each handles best.
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Pricing Breakdown
Pricing models vary dramatically between these providers. Some charge per transaction only. Others layer on monthly minimums or interchange markups. Understanding the actual cost per sale requires looking beyond headline percentages.
| Provider | Card Transaction Fee | Monthly Fee | Minimum Commitment | Payout Timeline |
|---|---|---|---|---|
| Klarna | Custom per agreement | Custom per agreement | Custom per agreement | Per settlement schedule |
| Adyen | 0.11 EUR + interchange + 0.60% (Visa/MC EES) | 0 kr | ~1,000 EUR/month practical minimum | Next-business-day available |
| Stripe | 1.5% + 1.80 SEK (EES cards) | 0 kr | None | Standard next-business-day |
| Zettle (PayPal POS) | 1.85% per card transaction | 0 kr | None | Varies by PayPal policy |
Adyen’s Interchange++ model passes through the actual interchange cost plus a flat 0.60% markup. For a 500 SEK purchase, this translates to roughly 5 SEK for Swish and nearly 20 SEK for Klarna Pay Later. The catch is the practical minimum invoice of around 1,000 EUR per month, which disqualifies Adyen from most micro-businesses but keeps it competitive for established operations processing significant volume.
Stripe uses straightforward percentage-plus-fixed pricing with no minimum commitment. At 1.5% + 1.80 SEK per EES card transaction, costs scale linearly with revenue. Klarna does not publish standard rates — the fee structure depends entirely on negotiated agreements or partner integrations, making direct price comparison difficult until you receive a custom quote.
Zettle charges a flat 1.85% on every card transaction with no monthly fees. The simplicity works well for low-volume sellers who process fewer than 50,000 SEK per month. Above that threshold, the flat percentage becomes noticeably more expensive than tiered or interchange-based alternatives.
Integration and Technical Requirements
The technical barrier to accepting payments varies from plug-and-play hardware to full API customization. Your existing e-commerce platform and whether you operate a physical store heavily influence which provider fits.
Plug-and-Play Hardware
Zettle was built for this approach. You order a reader or terminal, download the app, and start taking payments within minutes. The PayPal Reader costs from 249 SEK. The all-in-one PayPal Terminal starts at 1,999 SEK. Both connect via Bluetooth or Wi-Fi, include battery operation, and require zero development work. Swish payments are included at no extra cost.
This simplicity comes with limitations. Zettle’s native feature set is basic inventory management and sales reporting. Complex product catalogs, subscription billing, or multi-currency storefronts require workarounds or switching to a more capable platform.
Platform-Agnostic API
Stripe operates differently. It provides both hosted checkout pages that require no coding and a full API suite for custom integrations. The technical depth depends entirely on your needs. A Shopify store connects to Stripe through a few clicks. A custom web application might spend weeks building webhook handlers, idempotency keys, and reconciliation logic.
Stripe also resells Klarna and Swish in authorized configurations, meaning you can add buy-now-pay-later and Swedish bank transfers through a single Stripe dashboard rather than managing separate vendor relationships.
Enterprise-Grade Infrastructure
Adyen sits at the opposite end of the spectrum. Its single-platform architecture handles online cards, in-store terminals, Swish, Klarna, multi-currency accounts, and even issuing its own cards — all managed from one dashboard. But this power demands commercial presence. Adyen requires a Swedish business entity, targets mid-market and enterprise merchants, and expects significant transaction volumes to justify the onboarding effort.
Small businesses sometimes access Adyen indirectly through partners or larger platform integrations where Adyen operates as the backend processor while the merchant-facing brand belongs to someone else.
Sales Channel Coverage
Different providers excel in different environments. Matching capability to your actual sales channels prevents paying for features you never use.
| Provider | Online Checkout | In-Store POS | Mobile/On-the-Go | Buy Now Pay Later | Multi-Currency |
|---|---|---|---|---|---|
| Klarna | Excellent | Limited | App-based | Core offering | Partial |
| Adyen | Excellent | Excellent | Tap to Pay | Via Klarna integration | Yes |
| Stripe | Excellent | Via Terminal | Good | Via Klarna integration | Yes |
| Zettle | Limited | Excellent | Excellent | No | Limited |
Klarna dominates the buy-now-pay-later space in Sweden and Scandinavia broadly. Its payment options — Pay Now, Pay Later, and Pay Over Time — are embedded directly into the consumer checkout experience. Klarna reaches customers who prefer financing over immediate payment and has been shown to increase average order values for participating merchants. However, Klarna’s standalone integration is primarily online-focused, and in-store capabilities remain limited compared to full POS systems.
Adyen covers every channel natively. If you run an online store, a physical shop, and sell at pop-up markets, Adyen handles all three through one contract, one dashboard, and one settlement account. That consolidation matters when reconciling books at month-end.
Stripe matches Adyen across online and mobile channels through its Terminal product and Tap to Pay functionality. The in-store experience works well but lacks the dedicated hardware ecosystem that Zettle offers for pure retail operations.
Zettle owns the on-the-go and small retail segment. Its hardware is purpose-built for face-to-face transactions. But its online presence is minimal — you cannot build a full e-commerce checkout on Zettle alone.
Payout Speed and Cash Flow Impact
When money actually hits your bank account affects working capital more than the headline transaction rate. All four providers settle funds, but timelines differ.
Stripe processes payouts on a standard next-business-day schedule with configurable delays. Settlement follows a predictable rhythm that makes cash flow planning straightforward. Klarna operates on its own settlement cycle governed by individual agreements, with detailed settlement reports available for accounting reconciliation. Adyen offers next-business-day payouts for eligible transactions when configured correctly, though the exact timeline depends on your contract terms and risk profile. Zettle routes settlements through PayPal’s policies, which introduce variability that smaller businesses should factor into their cash reserves.
Which Provider Fits Your Business
The decision comes down to three factors: your sales channels, your technical capacity, and your monthly volume.
If you sell exclusively in person — at a market stall, cafe, or small boutique — Zettle delivers the fastest setup with zero learning curve. The 1.85% rate is manageable under 50,000 SEK monthly revenue.
If you run an online store and want maximum payment method coverage with minimal integration effort, Stripe provides the broadest toolkit. Add Klarna through Stripe’s native integration for BNPL without managing a second vendor.
If you operate across multiple channels with substantial volume and need unified reporting, Adyen consolidates everything but requires the commercial scale to make its minimum commitments worthwhile.
If your primary goal is offering flexible payment terms to Swedish consumers and your sales happen online, Klarna stands alone in market penetration and consumer recognition within the region.