API Integrations for Business
API integrations for business eliminate manual data entry between ERP, CRM, accounting, marketplaces and courier systems. You get real-time sync across disparate platforms, fewer copy-paste errors and an architecture that scales with growth.
What our API integrations include
REST, GraphQL and SOAP clients
All major protocols in one unified layer — modern REST API integration, GraphQL for flexible queries, legacy SOAP for banking and government endpoints. We abstract the third party away from your application code.
Bidirectional webhook integration
Real-time webhook integration — events flow under a second between systems. HMAC-signed requests, idempotency keys against duplicates, replay endpoints if the receiver was offline.
Middleware with message queue
For flows above 100,000 events per day we put RabbitMQ or Apache Kafka between systems. If eMAG is down for an hour, orders are not lost — they are processed the moment the service is back.
Retry and dead-letter handling
Exponential backoff for transient errors (429, 503), dead-letter queues for unprocessable messages, automatic alerts to operators. Every failure is visible and recoverable.
Observability and alerts
Structured JSON logs, OpenTelemetry tracing, Prometheus metrics, Grafana dashboards. Latency per endpoint, errors by code, pending queue depth. Alerts to Slack or Telegram on deviation.
Schema mapping and security
Field-by-field mapping between data models, OAuth2 with refresh rotation, API key vault, mTLS for banking. Outbound rate limiting against third-party quotas keeps you within the 1000 requests per minute window.
Who it is for
E-commerce with marketplaces
Retailers running their own store plus eMAG, Allegro or Amazon. One stock pool across channels, automatic order routing to the ERP, real-time price and inventory updates. The overselling problem disappears.
B2B with CRM, ERP and accounting
Sales in HubSpot or Salesforce, operations software for production and warehouse, accountant on a local package. Integration pushes a won deal from CRM into the ERP as an order, and invoices back into accounting without double entry.
SaaS platforms with external data
Product companies aggregating data from dozens of external APIs — payments, KYC providers, email services, AI models. We build an internal iPaaS layer that centralizes auth, retry, logging and rate limiting across vendors.
How we build it
1. Discovery and mapping
We map every system in scope, document data flows, estimate daily event volume and SLA needs. Output is an architecture diagram and a field-by-field mapping table between systems.
2. Stack and architecture
Default stack is Node.js or .NET for backend logic, PostgreSQL for event persistence, Redis for idempotency. For complex flows we use n8n as a visual orchestrator or write custom middleware. Grafana and Prometheus from day one.
3. Build, test, staging
Development in staging with mocked external APIs, automated tests for happy path and failure scenarios (70%+ coverage on critical paths). Pre-production runs with real traffic for 1-2 weeks to catch edge cases.
4. Monitor and ongoing support
After go-live we watch metrics 24/7. Business-hours SLA on the integration layer. When a third party changes (new eMAG API version, for example) we own the adaptation. See API integrations.
Why Saitami for API integrations
saved per employee per week
after eliminating manual data transfer between three or more business systems
integration layer uptime
achieved through retry, dead-letter queues and automatic failover across instances
starting investment
for the first integration between two systems with base webhooks and retry logic
Concrete scenarios: Stripe payments integration and eMAG marketplace integration. Also see custom software development and business process automation.
Frequently Asked Questions
What is an API integration and when do I need one?
An API integration is a programmatic bridge between two or more systems that lets them exchange data automatically — without humans copying records through Excel. You need one when the same entity (customer, order, invoice) lives in two systems and staff spend hours syncing. The usual trigger is 8-10 hours of weekly manual reconciliation.
What is the difference between a webhook and an API?
An API call is pull-based — your system polls the external one and waits for a response, often every few minutes. A webhook is push-based — the external system notifies you the moment an event happens. For transactional flows like payments and orders, webhook integration is faster and cheaper in request count.
How many systems can I integrate at once?
Technically there is no limit. The simplest case connects two systems point-to-point. Past 4-5 systems we recommend a hub-and-spoke or ESB / iPaaS architecture with middleware at the center — otherwise you get a mesh of pairwise links impossible to maintain. We have clients with 12+ systems around one layer.
How much does an API integration for business cost?
A first integration between two systems with base webhooks and retry logic starts at €1,800. Mid-complexity projects with 3-5 systems, schema mapping and monitoring usually run €4,500-€12,000. Enterprise iPaaS with message queues, OAuth2 and legacy connectors can reach €25,000-€40,000. No monthly license fees.
Ready to connect your systems?
Tell us which systems are in scope and which flows you want to automate — we will return a free integration architecture with concrete components and a fixed budget for the first phase of API integrations for business.
Free integration architecture →