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
Service
I CONNECT SYSTEMS AND AUTOMATE THE WORK.
Payments, ERP, CRM and couriers connected to each other. Data moves both ways, and integration errors show up in logs, not on invoices.
Message me on WhatsApp- Quote within 2h
- on working days
- 5.0★
- 30+ reviews
- Michał Grycz
- direct contact
Scope and pricing
Most Popular
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)
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
API integration and configuration process
- 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.
- 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.
- I test scenarios
I test standard and edge cases plus webhooks, and ensure idempotency so payments and orders are never duplicated.
- I deploy and support
I deploy to production, add logs, alerts and documentation. I support you and help disable the integration if ever needed.
Client reviews
All reviews →„Michał is an absolute pro. He guided me step by step through the entire process of building a website. For me it seemed impossible, but his patience and expertise brought a fantastic result. HIGHLY RECOMMENDED!“
„I recommend.“
„100% recommend. Help and support at the highest level. Very quick turnaround. 🙂“
Frequently asked questions
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.
More about this service
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.
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.
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.
Contact details
Email address
kontakt@mgsupport.plDirect phone
+48 453 653 831Registered office
ul. Brzozowa 14, 07-207 Rząśnik
Business hours
Monday-Friday: 08:00-18:00 Warsaw time
Response time under 2h on workdays
12-month code quality warranty
Full confidentiality & NDA on request
Full IP transfer & EU VAT invoices
Tell me what you need
A few sentences are enough. Include the scope and deadline for an initial quote.
Initial quote within 2 hours on working days, Monday to Friday, 08:00-18:00 Warsaw time. Messages outside these hours are handled on the next working day.
Message me on WhatsApp