Payment Integration & Migration

Expert Payment Processing Integration

We specialize in building and migrating payment systems that handle millions in transaction volume. Whether you're integrating Stripe for the first time, migrating from Adyen, or building custom payment flows, we deliver fault-tolerant solutions under high-stakes conditions.

What We Do

Payment Gateway Integration

• Stripe, Adyen, PayPal, Braintree implementation
• Multi-method support: credit cards, digital wallets (Apple Pay, Google Pay), ACH, SEPA
• PCI compliance and security best practices
• Subscription billing and recurring payments
• One-time payments and checkout flows

Zero-Downtime Migration

• Migrating millions of live subscriptions without revenue disruption
• Comprehensive testing and verification pipelines
• Rollback strategies and risk mitigation
• Data reconciliation and audit trails
• Multi-region payment support

Complex Payment Flows

• Setup Intents and payment method mandates
• Multi-currency and localization
• Payment retry logic and dunning management
• Webhook handling and event processing
• Custom error handling for edge cases

Technologies

Ruby on Rails, Node.js, Stripe API, Adyen API, PayPal SDK, AWS EventBridge, Lambda functions, PostgreSQL, Redis, background job processing (Sidekiq, DelayedJob).

Case Study

Babbel Payment Migration

Led the migration of Babbel's recurring billing infrastructure from Adyen to Stripe, processing millions of live subscriptions across global markets with zero downtime and complete auditability.