Ehsan Ullah

Service

Custom API Development for Web and Mobile Apps

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What is custom API development, and when do you need it?

An API (application programming interface) lets two systems talk to each other securely. You need custom API development when a mobile app needs a backend, when a Next.js or React frontend needs data, or when your website must sync with tools like payment gateways, couriers, eBay, CRMs or Google Sheets.

Who is it for?

  • Mobile app teams that need a secure, documented backend and app APIs
  • Businesses connecting their website to payment, courier, marketplace or accounting tools
  • Companies moving to a headless setup with a Next.js or React frontend
  • Teams whose current API is slow, undocumented or insecure

What is included in api development?

  • RESTful API design with consistent endpoints, versioning and error formats
  • Authentication with tokens (Laravel Sanctum / Passport) and role-based permissions
  • Mobile app backends: users, push notification hooks, uploads and sync
  • Third-party integrations: payment gateways, courier APIs, eBay, Shopify, CRMs, OpenAI
  • Google Sheets sync so teams can work in a spreadsheet while data stays in your database
  • Webhooks, queues and retries for reliable background processing
  • Rate limiting, input validation and logging
  • API documentation your frontend or app developers can follow

How does the process work?

  1. 1

    Map the data

    Agree what each system needs to send and receive, and who is allowed to do what.

  2. 2

    Design the contract

    Endpoints, payloads and error formats are documented before building.

  3. 3

    Build and secure

    Endpoints are implemented with validation, authentication and rate limits.

  4. 4

    Test with real clients

    The app, frontend or partner system is tested against a staging API.

  5. 5

    Monitor

    Logging and alerts catch failed calls and integration problems early.

Which technologies are used?

  • Laravel
  • PHP 8
  • MySQL
  • Sanctum / Passport
  • Queues & webhooks
  • Postman
  • OpenAPI

Which integrations can be built?

Common examples include payment gateways, courier and shipping APIs for COD stores, eBay listing and order sync, Shopify data sync, WhatsApp order confirmation, CRM and email tools, OpenAI and other LLM APIs, and two-way Google Sheets sync for teams that live in spreadsheets.

If a service has a documented API, it can usually be connected to your Laravel application.

Why does API quality matter for a business?

A badly designed API causes slow apps, duplicate orders and data that does not match between systems. A well-designed API is predictable, secure and documented, so new apps and partners can be added without rewriting what already works.

API Development: frequently asked questions

Can you build the backend API for my mobile app?

Yes. Ehsan builds Laravel API backends for Android, iOS and Flutter or React Native apps, including authentication, user data, uploads and admin dashboards to manage the app content.

Can you sync my website or app with Google Sheets?

Yes. Orders, leads or inventory can be pushed to Google Sheets automatically, and changes in the sheet can be pulled back into your system on a schedule, using the Google Sheets API.

Do you integrate eBay and Shopify APIs?

Yes. Typical work includes syncing products and stock, importing orders and updating tracking numbers between eBay, Shopify and your own database or dashboard.

Will the API be documented?

Yes. Every API is delivered with documentation of endpoints, parameters, authentication and example responses, so other developers can use it without guesswork.

Need api development? Let’s talk.

Tell me what you need, whether that’s a web app, a store, an AI feature, more leads or a faster website. You’ll get a clear reply within 24 hours.

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