eCommerce Payment Integration Specialists

The Right Payment StackFor Every Checkout

We integrate cards, wallets, BNPL, and express checkout flows into your eCommerce platform — engineered for conversion, built to handle real transaction volume.

Cards, wallets & BNPL
PCI-compliant integrations
Faster checkout, higher conversion
Payment Solutions

Payment Solutions We Integrate

From card payments to BNPL to express checkout — we implement the full modern payment stack, tailored to your platform and customer base.

Buy Now, Pay Later & Installment Solutions

BNPL is one of the highest-impact checkout additions for average order value. We integrate the leading deferred and installment payment providers — with UI widgets, eligibility checks, and merchant settlement flows handled end to end.

Klarna
Pay in 3, Pay in 30, Financing — full Klarna checkout suite
Mokka
Installment payments popular in Eastern European markets
Revolut Pay Later
Flexible deferred payments via Revolut ecosystem
Other BNPL Providers
Scalapay, Twisto, Paidy, and any provider with an API

Why it matters for your store:

  • Higher average order values — customers spend more when payments are split
  • Reduced cart abandonment on high-ticket items
  • Eligibility widgets displayed at product level, not just checkout
  • Merchant settlement handled automatically by provider
Discuss this integration
Multi-Platform

Platforms We Support

We integrate payment solutions across the major eCommerce platforms — with platform-native implementations that work with the platform, not around it.

Magento / Adobe Commerce

Deep Magento 2 expertise — we build native payment modules that integrate with the Magento quote, order, and invoice lifecycle correctly. Open Source and Adobe Commerce supported.

  • Native Magento payment modules
  • Compatible with Hyvä and PWA frontends
  • Multi-store and multi-currency support
  • Adobe Commerce B2B payment workflows

Shopify & Shopify Plus

Shopify payment integrations built via Shopify Payments, custom payment apps, and checkout extensions for Shopify Plus merchants needing beyond-standard payment flows.

  • Shopify Payments and external gateways
  • Checkout Extensions (Plus only)
  • BNPL via Shopify app ecosystem
  • Subscription and recurring billing

Shopware

Shopware 6 payment integrations using the official Payment Handler API — covering async payment flows, refunds, and payment state management within the Shopware order lifecycle.

  • Shopware Payment Handler API
  • Async and synchronous payment flows
  • Refund and capture management
  • Storefront and headless (Composable Commerce)

WooCommerce

WooCommerce payment gateway plugins and custom integrations — built to the WooCommerce payment API standards, with support for subscriptions, pre-orders, and split payments.

  • WooCommerce gateway plugin development
  • WooCommerce Subscriptions compatible
  • Blocks checkout support
  • HPOS (High-Performance Order Storage) ready

Custom eCommerce Platforms

For bespoke or in-house platforms, we integrate payment providers directly via their APIs — designing the payment flow, webhook handling, and order state machine to fit your architecture.

  • Direct payment provider API integration
  • Custom webhook and event handling
  • Payment state machine design
  • PCI-scope reduction via hosted fields
Free Payment Audit

Is Your Checkout Costing You Conversions?

We audit your current payment stack, identify friction points and missing options, and give you a clear recommendation — at no cost and with no obligation.

Get a Free Payment Audit
Outcomes

What the Integration Should Achieve

Payment integration is not a technical checkbox — it is a commercial decision. These are the outcomes we design every integration to deliver.

Increase Conversion Rate

Every unnecessary step in checkout costs you revenue. We design payment flows that minimise friction — fewer fields, faster authentication, fewer drop-offs.

Raise Average Order Value

BNPL and installment options consistently increase AOV because customers can afford more when payments are spread. We implement these without disrupting your checkout UX.

Reduce Fraud & Chargebacks

3DS2, velocity checks, and provider-level fraud tools are configured correctly from day one — not bolted on after problems surface.

Improve Repeat Purchase Rate

Saved cards, tokenised wallets, and one-click flows for returning customers remove every barrier to a second and third purchase.

Support International Markets

Different markets require different payment methods. We integrate the providers your target customers actually use — not just the ones that are easiest to set up.

Accelerate Mobile Checkout

Apple Pay and Google Pay reduce mobile checkout to two taps. On mobile, this is the single highest-ROI payment improvement most stores can make.

Tailored Approach

Built Around Your Business Model

The right payment stack depends on who your customers are and how they buy. We design around your model — not around what is easiest to implement.

B2C Retail

High-volume consumer stores need fast checkout, express wallets, and BNPL to compete. We optimise the full funnel from product page payment widgets to one-click repeat purchase.

  • Apple Pay & Google Pay at product level
  • BNPL eligibility shown before checkout
  • Saved card flows for returning customers
B2B Commerce

B2B payment needs are different — account credit, payment terms, PO-based ordering, and invoice payment. We build these flows into the checkout without disrupting standard B2C journeys on the same store.

  • Net payment terms and invoice ordering
  • Credit limit enforcement at checkout
  • PO number capture and account payment
Subscription & Recurring

Subscription billing requires reliable card tokenisation, retry logic on failed payments, and dunning management. We implement recurring payment flows that minimise churn from payment failures.

  • Tokenised card storage for recurring billing
  • Smart retry logic and dunning flows
  • Customer self-service payment management
Marketplace & Multi-Vendor

Marketplaces require split payments, vendor payouts, and escrow-like flows. We implement these using provider-native split payment capabilities or custom payout logic.

  • Split payment and vendor settlement
  • Commission and fee deduction at payment
  • Multi-currency payout management
Why Clever++

Payment IntegrationBuilt for Conversion

We have integrated payment solutions into more stores than most agencies will ever build. That experience means fewer surprises, faster delivery, and integrations that actually perform.

  • We understand both the technical and commercial side of payment integration
  • Deep experience with PCI-DSS scope reduction — we keep your compliance surface minimal
  • SCA and 3DS2 implemented correctly — not just bolted on to pass validation
  • BNPL provider relationships — we know how the merchant onboarding and settlement flows work
  • Platform-native implementations — no hacks, no workarounds, no technical debt
  • Post-launch monitoring of payment success rates and decline reasons
  • We test edge cases — partial refunds, failed captures, network timeouts, and expired cards
  • Fixed-price scoping — you know exactly what you are getting before we write a line of code
Experience
in Payment integrations
10+
Payment providers integrated
5+
eCommerce platforms supported
15+
Years of checkout expertise
Free Payment Audit

Let Us Review YourPayment Stack

Tell us about your platform, your current payment setup, and what you are trying to improve. We will come back with a free audit and a clear recommendation.

Email
office@cleverplusplus.com
Cluj-Napoca, Romania
Free payment audit24h responseNo commitment