API Integration

I CONNECT SYSTEMS
AND AUTOMATE THE WORK.

Payments, ERP, CRM, shipping, SMS, webhooks. Config, auth, error logs, tests — data flows without manual work.

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5.0 Google (30 reviews) Free quote in 24h No templates · 100% Custom

Real projects, not templates

Selected live client websites and web applications built from scratch:

WordPress · Nieruchomości View in portfolio →

anbinvest.pl

Modern housing developer platform: investment presentation, fast contact, mortgage tools.

Strona WWW · 100/100 PSI View in portfolio →

heeze.pl

Ultra-fast business website with full mobile responsiveness and Core Web Vitals optimization.

Platforma Web · E-Commerce View in portfolio →

stormfactory.eu

Custom B2B web platform with dynamic product presentations and secure infrastructure.

View full portfolio (35+ projects)

APIs that actually connect systems

Any documented API

REST, GraphQL, SOAP. Payments, couriers, ERP, CRM, SMS and custom company endpoints.

Secure configuration

Secrets off the frontend, OAuth/keys, rate limits and proper CORS — no token leaks.

Logs, retries, webhooks

When a partner API fails, work is not lost: queue, retries and email alerts.

Systems do not talk and you lose data?

Manual copy between store, ERP, and accounting creates errors. I automate the full data flow with API integration.

Excel as your system integration?

Manual CSVs mean errors and delays. APIs sync stock, orders and invoices automatically.

Works in demo, fails in production?

I test edge cases, rate limits and idempotency. Logs and alerts catch failures before customers do.

API keys in front-end code?

That is a leak waiting to happen. Secrets stay server-side with rotation and least privilege.

Duplicate orders after a webhook?

I build idempotent handlers: the same event will not create two payments or two shipping labels.

Packages & pricing API integrations

*Pricing depends on API docs, endpoint count, auth (OAuth/keys) and environment (sandbox/prod). I confirm it before we start.

Single API

from 250 EUR

I wire and configure one external API: payments, SMS, courier or CRM. You can trust it works from day one.

Auth (API key / OAuth 2.0)
Field mapping and error handling
Sandbox tests + documentation

Connect one API

Integration pack

from 600 EUR

I connect 2–4 integrations with logs, retries, webhooks and a status overview. I keep an eye on it even after launch.

Webhooks + retry queue
Error logs and email alerts
Environment config (dev/prod)

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Middleware / API Hub

Custom quote

I build a layer connecting ERP, e-commerce, accounting, warehouse and your own APIs. Your systems finally talk to each other.

API-first architecture + OpenAPI docs
Security: rate limits, secrets, CORS
Monitoring and business SLA

Design an API Hub

API integration and configuration process

I set scope, integrate, test and monitor. A written quote, staged progress and a clear it-works criterion.

Clear stages, no hidden costs – from first call to launch.

Step 1: I analyze and define

We read API docs and define endpoints, limits and data model. I set up a sandbox and keep keys away from the frontend.

Step 2: I integrate and code

I write the API client, map fields and validate responses. I handle errors so the system runs stably from day one.

Step 3: I test scenarios

I test standard and edge cases plus webhooks, and ensure idempotency so payments and orders are never duplicated.

Step 4: I deploy and support

I deploy to production, add logs, alerts and documentation. I support you and help disable the integration if ever needed.

FAQ: API Integration

Which APIs can you integrate? +

Practically any API with REST, JSON, GraphQL or SOAP docs. I have integrated PayU, Stripe, couriers, Baselinker, ERP, CRM, SMS, Google, Meta and custom endpoints.

Do I need developer access to the API? +

Yes, API keys, a sandbox account or OAuth are enough. I help generate and store them securely. Secrets never end up in front-end code.

What happens if a partner API fails? +

I build error handling, retries, logs and alerts. During longer outages the system loses no data. Operations queue up and resume once the API is back.

How do you integrate payment gateways (BLIK, PayU, Stripe, Przelewy24)? +

I integrate gateways directly via official REST APIs and secure webhooks. I set up instant transaction callbacks, automated order processing, invoicing, and refunds for BLIK, Apple Pay, Google Pay, and cards.

How long does it take and how much does a payment or courier API integration cost? +

A standard payment gateway (Stripe, PayU, Przelewy24) or shipping API (InPost, DPD) integration takes 2–4 business days. Pricing starts from 800–1500 PLN net including sandbox and production validation.

API integrations that work in production

I wire any documented API: payment gateways, warehouses, CRM, SMS, couriers, and your company endpoints.
Configuration covers auth, data mapping, error logs, retries, and sandbox tests. The integration works in production, not just in a demo.

First docs and secrets. Then client code and mapping. Finally tests, logs, and production.

Result: systems exchange data automatically — less manual work and fewer order errors.

Connect your business systems via API – tell me what should talk to what. - API Integration

Payments, ERP, CRM, shipping, SMS and custom endpoints. I configure auth, mapping and monitoring — so data does not die in Excel.

I build WordPress, WooCommerce, PrestaShop, and custom systems. Mobile-first, Core Web Vitals 95+, SEO optimisation, and schema markup. Serving businesses in Poland and internationally. Instalment payments, post-launch support, and CMS training included.

Ask about API integration →

I CONNECT SYSTEMS AND AUTOMATE THE WORK.