HIGH LINE Commerce
An e-commerce platform for our own apparel brand that brings together storefront, admin panel and API.
Make your systems understand each other.
Reliable connections between your systems and payment, shipping, accounting and third-party services.
An integration is only as good as what happens when the other side does not answer. We design APIs with explicit contracts and build in retries, duplicate protection and error records from the start.
Problems businesses run into
What we often find
- Manual data transferOrder and invoice data is copied between systems.
- Links that break silentlyNobody sees the problem until a customer complains.
- Requests processed twiceA retried payment may be recorded twice.
What we propose
Our approach
- Documented API contractOpenAPI and schema validation keep both sides aligned.
- Idempotent operationsHowever many times a request arrives, it has one effect.
- Traceable flowsFailed calls are recorded and can be reprocessed.
What we do
Webhook infrastructure
Signed, retried event delivery.
Payment and accounting links
Integration with payment gateways and accounting services.
Real-time communication
Live updates over WebSocket.
Errors and retries
No data loss when the other system does not respond.
Webhook handling
Safe processing of repeated or out-of-order events.
API documentation
OpenAPI-based documentation that stays current.
Where it helps
E-commerce operations
Connecting payments, shipping and accounting.
Opening an API on your product
Key-based access for partners.
Live screens
Panels that change in real time and multiplayer systems.
Payment, shipping and invoice links
Removing manual data transfer from operations.
Technologies we use
- NestJS
- Hono
- WebSocket
- Redis
Related projects
Frequently asked questions
What if the other system is poorly documented?
We measure its behaviour in a test environment, document it and state the risk up front.
Do you maintain integrations?
Yes, under a monitoring and maintenance agreement.
What if the other system has no documentation?
We work out its behaviour through testing and share risks and limits in advance.
How do we know if an integration breaks?
Error rates and queue length are monitored, and alerts reach the assigned people.
