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E-Commerce & CMS

Payment Integration Services

Payment Integration Services

Quecko builds custom, highly secure payment integrations designed to optimize transaction authorization rates and protect customer data. From standard credit cards and digital wallets (Apple Pay, Google Pay) to automated multi-party payouts and global tax calculations, we engineer checkout checkouts that perform reliably.

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400+clients across 20+ countries
$300M+in funds generated
250+products built
150+engineers worldwide
400+clients across 20+ countries
$300M+in funds generated
250+products built
150+engineers worldwide
400+clients across 20+ countries
$300M+in funds generated
250+products built
150+engineers worldwide
400+clients across 20+ countries
$300M+in funds generated
250+products built
150+engineers worldwide
What We Build

Comprehensive Payment Engineering

01

Secure Tokenized Checkout

Integrating payment gateways using secure tokenization and hosted fields, keeping your servers out of raw card data scope.

02

Digital Wallet Integrations

Implementing Apple Pay and Google Pay checkouts to enable single-tap purchases on mobile and desktop.

03

Multi-Party Split Payouts

Engineering Stripe Connect integrations to calculate platform commission percentages and route vendor split payouts automatically.

04

Subscription Billing Platforms

Custom recurring billing engines supporting usage-based metering, prorated tier upgrades, and automated dunning.

05

Global Currency & Localization

Integrating dynamic pricing rules to display localized currencies and support international payment alternatives (Klarna, Bancontact).

06

Automated Tax Compliance

Connecting checkout fields to tax engines (Avalara, Stripe Tax) to calculate and apply localized sales taxes dynamically.

The Challenge

A slow, unoptimized checkout page will drive away buyers at the final step.

The checkout page is the most critical part of the conversion funnel, yet it is often the most neglected technically. Bloated checkout scripts, complex forms, and lack of localized payment options lead to abandoned carts and lost sales. Furthermore, handling card inputs directly on your servers introduces massive security risks and compliance (PCI-DSS) overhead. A single leak of customer data can destroy customer trust and invite legal liabilities. Quecko builds payment checkouts with security. We integrate Stripe, Adyen, and regional processors utilizing secure tokenization models, ensuring customer data is never exposed on your servers while offering fast checkout experiences.

Execution Blueprint

From Day 1 to Day 60: What Payment Integration Looks Like

01Day 1–15

Gateway Selection & Schema Mapping

Selecting processors (Stripe/Adyen), wireframing checkouts, mapping database logs, and drafting security plans.

02Day 16–35

Tokenization & Hosted UI

Coding checkout pages, implementing secure iFrame forms, and configuring Apple/Google Pay.

03Day 36–50

API webhooks & Ledgers

Developing automated API webhooks, verifying payment state databases, and integrating tax calculations.

04Day 51–60

Audit, QA & Release

Testing checkout failure edge cases, running penetration tests, verifying data security, and live deployment.

Technology

Technologies We Master

Tools, frameworks, and protocols we use to build secure and scalable solutions.

Payment SDKs

Stripe Elements/ConnectStripe Elements/Connect
AdyenAdyen
BraintreeBraintree
PayPal SDKPayPal SDK

Identity & Compliance

PCI-DSS Level 4 architecturesPCI-DSS Level 4 architectures
TLS 1.3 encryptionTLS 1.3 encryption
tokenizationtokenization

Core Languages

Node.jsNode.js
TypeScriptTypeScript
Python (Django)Python (Django)
GoGo

Integrations

Stripe TaxStripe Tax
AvalaraAvalara
TaxJarTaxJar

Testing & Tools

Gateway testing sandboxesGateway testing sandboxes
PostmanPostman
automated webhook simulatorsautomated webhook simulators
Our Edge

We Build Secure Payment Checkouts That Perform at Scale.

We build checkout architectures that isolate card data on input, minimizing audit requirements for your team.

PCI-DSS Compliance Experts

We build checkout architectures that isolate card data on input, minimizing audit requirements for your team.

Webhook Reliability Paranoia

We build resilient webhook receivers that process payment notifications securely, preventing missed orders or double charges.

Conversion-Optimized UI Design

We optimize form layouts, error messages, and payment selections to minimize checkout abandonment.

250+ Products Shipped

We combine transaction-level security with modern user experience design to deliver stable, high-converting platforms.

Our Work

Our Projects

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Social Proof

“The work Quecko has done has been absolutely brilliant. Extremely responsive, reliable, and fast — we can throw last minute requests in and they'll get them done by the end of the day.”

Tom Blears

Chief Executive Officer, Bitcast
Engagement

How We Collaborate

Dedicated FinTech Pod

Full-time payment engineers, API integration specialists, and checkout QA supporting your systems.

Project-Based Checkout Build

End-to-end development of your payment gateway integration and checkout flow.

Gateway Migration Sprint

Focused project to migrate transaction engines from legacy gateways to Stripe or Adyen without downtime.

FAQ

Frequently Asked Questions

We use payment SDKs that use hosted fields (like Stripe Elements). The card details are encrypted directly on input and sent directly to the gateway. Our databases only save a secure payment token, keeping your servers out of card data security scopes.

We build resilient webhook queues. If a webhook notification fails, our systems retry processing the request. We also implement backup API checks that check payment states when a user returns to the success page.

Yes. We integrate multi-party split engines (like Stripe Connect). When a customer checks out, the payment engine processes the transaction, deducts your platform fee, and routes the split payouts to vendors' accounts automatically.

Yes. We configure gateways to check user locations and dynamically display localized payment options—Klarna, Bancontact, iDEAL, or Giropay—increasing conversion rates for international traffic.

Blogs

Latest Stories from Quecko

Ready to implement a secure, conversion-optimized payment integration?

From tokenized checkouts and digital wallet integrations to Stripe Connect payouts and automated tax calculations — Quecko builds checkouts designed to convert.

Talk to a Payment Integration SpecialistView Our Portfolio