Hakan Sevimoğlu Hakan SevimoğluFreelance Developer · 18 yrs
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Payments · Shipping · ERP

API Integration Services: Get Your Systems Talking to Each Other

I turn manual data transfers between different software into automated, error-free and traceable integrations.

Quick answerAPI integration connects different software (payments, shipping, ERP, marketplaces, etc.) so they exchange data automatically. Hakan Sevimoğlu takes REST, SOAP/XML and webhook-based integrations to production after testing them with real request and response data.
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Written by Hakan Sevimoğlu · Last updated:

How to build error-free integrations

The most common integration problem is that the real API behaves differently from its documentation. That is why every integration is verified against real request and response logs, errors are logged and a retry mechanism is put in place.

For example, the Aras Kargo order panel collects orders from multiple sites on a single screen and ships them in bulk.

What I offer

  • Payment API

    iyzico, PayTR and virtual POS.

  • Shipping API

    Aras Kargo shipments, barcodes and tracking.

  • ERP & accounting

    Data transfer with SAP, Netsis and Logo.

  • Marketplaces

    Product, stock and order synchronization.

  • Crypto & exchanges

    Trading automation with exchange APIs.

  • Webhooks & automation

    Event-driven workflows and notifications.

Technologies I use

RESTSOAPXMLJSONWebhookOAuth2PHPNode.jsPythoncron

Official documentation and resources

Standards and official documentation I follow in projects:

Example projects

A selection of live projects serving real users.

Order & Shipping Management Panel — Aras Kargo Integration screenshot – Imports Excel/CSV orders, lets you edit them, ships them to Aras Kargo in bulk, prints barcode labels and tracks delivery

Order & Shipping Management Panel — Aras Kargo Integration

Imports Excel/CSV orders, lets you edit them, ships them to Aras Kargo in bulk, prints barcode labels and tracks delivery.

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Crypto Trading API Integration screenshot – Automated trading infrastructure using exchange APIs

Crypto Trading API Integration

Automated trading infrastructure using exchange APIs.

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Paint Industry E-Commerce Platform screenshot – E-commerce with marketplace and PayTR integration

Paint Industry E-Commerce Platform

E-commerce with marketplace and PayTR integration.

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How we work

  1. Free intro call

    We clarify needs, existing systems and goals together.

  2. Quote & roadmap

    Scope, technology, timeline and budget within 24 hours.

  3. Staged development

    Weekly demos and a live test environment.

  4. Launch & support

    Go-live, training and ongoing maintenance.

Free pre-analysisThe first meeting and roadmap are completely free, with no obligation.

Staged delivery and approvalYou review each module on a test environment before we move on.

Written scope and rightsScope, delivery and source code rights are defined in the contract.

Frequently asked questions

Which types of APIs do you work with?

I work with REST/JSON, SOAP/XML and webhook-based APIs.

What happens when an integration fails?

Errors are logged, automatic retries are performed and notifications are sent when needed.

Can an integration be added to my existing system?

Yes; the existing code is reviewed and an integration layer that fits the architecture is added.

How long does an integration take?

A single, well-documented API usually goes live in 1–2 weeks.

Crypto Exchange API IntegrationBinance · OKX · BtcTurk APIFlight Booking WebsiteBiletBank · GDS · OTABlockchain & Crypto Exchange DeveloperCrypto · Web3 · API
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