Case study 03 · SwiftNine LLC · Mar 2026 – Aug 2026
Enterprise Commerce & Payment Platform
A centralized, multi-tenant commerce backend behind multiple Shopify and WooCommerce storefronts — one place for product sync, cross-store checkout and payment processing.
4
payment providers integrated
The problem
Several storefronts needed shared business logic, product synchronization, checkout orchestration and payment processing — without duplicating core backend functionality in every store.
Architecture
- 01Centralized business logic shared by every storefront instead of duplicated per store
- 02Cross-store checkout orchestration with cart and checkout synchronization
- 03Stripe, PayPal, Adyen and OceanPayment behind one payment layer
- 04Webhook-driven transaction reliability and payment workflows
Shopify storefronts
WooCommerce storefronts
Central commerce backendNode.js · REST · multi-tenant
Catalog & cart syncProducts · stores
Checkout orchestrationCross-store
PostgreSQLTenants · orders
Payment layerStripe · PayPal · Adyen · OceanPayment
WebhooksPayment events
Step through how a request moves through this system.
What I owned
- 01Designed the backend architecture
- 02Designed cross-store checkout workflows
- 03Implemented product and store synchronization
- 04Worked on cart and checkout synchronization
- 05Integrated the payment providers and their webhooks
- 06Focused on transaction reliability, security and maintainability
Outcome
Centralized checkout and payment workflows reduced duplication and payment-processing complexity across storefronts.
Stack
- Node.js
- JavaScript
- PHP
- Shopify
- WooCommerce
- REST
- PostgreSQL
- Stripe
- PayPal
- Adyen
- OceanPayment