Payment Integration Development Services
We integrate payment systems into web and mobile applications — from one-time purchases to complex subscription lifecycles. Our hands-on experience with Stripe, Paddle, PayTR, and native In-App Purchase systems means we understand the edge cases that break payment flows in production.
The Challenge
Payment integration goes far beyond displaying a checkout form. Subscription management requires handling trial periods, plan upgrades and downgrades, proration, failed payment retries with exponential backoff, grace periods, and cancellation flows. Mobile apps add another layer of complexity with Apple and Google's in-app purchase requirements, receipt validation, and the need for a unified billing state across web and mobile. Regional payment providers like PayTR have their own quirks, webhook patterns, and reconciliation requirements that differ significantly from global providers like Stripe.
Our Approach
We treat payment integration as a first-class architectural concern, not an afterthought. Each payment provider gets a dedicated service module with its own webhook handlers, event processing, and state management. For Contentrain, we implemented Stripe with full subscription lifecycle management — plan creation, customer portal, invoice generation, webhook event processing, and automated dunning for failed payments. For Yanyana, we built a dual payment system: Paddle for web subscriptions and In-App Purchase for iOS and Android. Both systems sync to a unified subscription state, so a user's access is consistent regardless of where they purchased. For RezMe, we integrated PayTR for the Turkish market, implementing the complete subscription lifecycle including trial periods, billing cycles, payment retries, suspension, and grace period management. The system handles webhook callbacks, payment status reconciliation, and automated notifications for payment events. For LineDiff, Paddle handles subscription management with support for multiple pricing tiers and annual/monthly billing options.
Technologies We Use
Key Benefits
Battle-tested integrations across 4 different payment providers. Unified subscription state management across web and mobile platforms. Robust webhook handling with idempotency and retry logic. Comprehensive error handling for failed payments, expired cards, and disputed charges. Regional payment provider expertise for the Turkish market (PayTR). Every payment integration we build includes comprehensive logging, Sentry error tracking, and reconciliation tools to ensure no transaction is lost.
Related Projects
Contentrain
Git-native Headless CMS platform. Contentrain combines Git workflows with content management, allowing developers and content creators to collaborate on the same platform. Built with Vue 3, NestJS, PostgreSQL, and a pnpm + Nx + Turbo monorepo architecture. Features 20+ modular NestJS modules, Stripe subscription management, TypeBox schema-first API design, and Atomic Design component architecture.
View projectYanyana
Social game platform for weddings, corporate events, and social gatherings. Supports P2P offline (2-10 players) and online event (50-500+ players) modes across Web (PWA), iOS, and Android. Built with React Native (Expo + CLI), Bun.js + ElysiaJS, Vue 3, and a pnpm workspaces monorepo with 4 apps + 4 shared packages. Features 12+ independent game engines, real-time WebSocket state sync, 39 shared Vue components as a design system, dual payment system (Paddle + In-App Purchase), and 130+ test files with 500+ tests including Stryker mutation testing.
View projectLineDiff
AI-powered text and document comparison platform. Local-first, offline-capable with client-side encryption for privacy. Supports 10+ file formats including txt, docx, pdf, json, xml, csv, md, html, and yaml. Built with Nuxt 4 + Vue 3, Firebase Firestore, and OpenAI API. Features IndexedDB primary storage with Firestore sync queue (local-first architecture), Web Workers for diff computation, Paddle subscription management, and integrations with Google Docs, Notion, and MS Word Add-in.
View projectRezMe
Restaurant discovery and reservation platform for iOS and Android. Users can discover restaurants and make reservations while restaurant owners manage their venue through a subscription model. Built with React Native (Expo SDK 53), Expo Router v5, Bun.js + ElysiaJS, and Supabase (PostgreSQL + Auth + RLS). Features 9 Zustand stores, multi-auth support (Email, Google, Apple, Phone OTP), 10-module layered API architecture, end-to-end subscription lifecycle with PayTR integration, and push notifications via Expo SDK.
Explore Our Other Services
NestJS Microservice Development Services
We design and build production-grade microservice architectures using NestJS, gRPC, and message queues. From API gateway design to inter-service communication, we deliver backend systems that scale with your business.
React Native Mobile App Development Services
We build cross-platform mobile applications with React Native — from consumer-facing apps to specialized commercial device software. Our experience spans Expo managed workflows for rapid development and bare React Native CLI for deep native integration.
SaaS Platform Development Services
We build SaaS platforms from the ground up — designing multi-tenant architectures, implementing subscription lifecycle management, and delivering scalable infrastructure that grows with your user base. From early-stage MVPs to enterprise platforms serving thousands of customers.
Nuxt.js & Vue.js Web Application Development
Vue.js and Nuxt.js are at the core of our frontend expertise. We build server-rendered web applications, single-page apps, and static sites with a focus on performance, SEO, and developer experience. From e-commerce platforms to SaaS dashboards, our Vue ecosystem expertise delivers production-grade results.
POS Application Development Services
We develop custom applications for commercial POS terminals — specifically Sunmi devices. From thermal printer control to foreground services for real-time order processing, we bridge the gap between React Native and native device capabilities with custom native modules.
AI-Powered Software Development Services
We integrate AI technologies into both our development workflow and the products we build. From using Claude Code and Codex as AI pair programming partners to embedding LLM capabilities directly into applications, AI is a core part of how we deliver software faster and smarter.