Gateway Migration
Zero-Downtime Stripe Multi-Currency Migration
Migrating Legacy Payment Gateway to Stripe Multi-Currency without System Downtime
These are R&D case studies—explorations and prototypes, not delivered client implementations.
Overview
The platform needed to leave a brittle legacy gateway for Stripe without interrupting revenue or recurring billing.
The Challenge
A digital platform stuck on a legacy gateway needed Stripe multi-currency support for India, Malaysia, and global customers—but could not afford checkout downtime or broken recurring billing during cutover.
Existing subscriptions, one-time checkouts, and refunds were tightly coupled to proprietary APIs. A hard cutover risked failed renewals and incomplete webhook coverage across currencies.
Our Solution
We executed a parallel-run migration: Stripe multi-currency checkout and billing were introduced beside the legacy gateway, with dual-write reconciliation, webhook parity checks, and a phased cutover that kept payments live throughout.
We mapped every payment, refund, and subscription lifecycle event to Stripe equivalents, ran both systems in parallel with reconciliation, then cut traffic gateway-by-gateway after parity was proven.
Implementation
- Inventory of legacy payment and subscription flows
- Stripe multi-currency checkout and Billing setup
- Dual-run reconciliation and webhook parity tests
- Phased cutover with rollback switches
- Post-migration monitoring and API version maintenance plan
Results & Impact
Key Achievements
- Zero checkout downtime during migration
- Stripe multi-currency live for MYR, INR, USD, and more
- Legacy gateway retired without orphaned subscriptions
- PCI-aligned tokenization and HMAC webhook verification
- Faster settlement visibility for finance teams
The business expanded internationally on Stripe without a single planned outage window. Finance gained clearer multi-currency reporting, and engineering inherited a maintainable payment pipeline.