API Creation & Integration

Connect systems. Extend capabilities. Power digital workflows.

APIs (Application Programming Interfaces) are the glue that binds digital systems together. Whether you're looking to build a custom API from scratch or integrate with an existing third-party service, Elusive Concepts can design, develop, and document reliable API solutions that enhance your business and unlock new opportunities.

From modern REST and RPC endpoints to legacy SOAP services, we work across a wide range of protocols to deliver the right solution for your use case.

Custom API Development

We architect and develop scalable, secure APIs tailored to your application’s logic and business goals. Whether it’s powering a mobile app, exposing data to partners, or enabling internal tools to talk to each other, we make sure the API is intuitive, stable, and thoroughly documented.

Our custom API services include:

• REST, RPC, and GraphQL architecture and implementation
• Authentication and rate-limiting strategies
• API versioning and backward compatibility
• Structured data responses (JSON, XML, custom schemas)
• Developer documentation and onboarding support

Third-Party API Integration

Your site doesn’t have to work in isolation. We help businesses integrate with industry-leading services — from CRMs and payment gateways to shipping providers, AI platforms, and social media tools.

We handle integrations such as:

• Salesforce, HubSpot, and Zoho CRM
• Stripe, Square, PayPal, and Authorize.net
• AWS, Google Cloud, and Microsoft Azure APIs
• OpenAI, Google Maps, Twilio, SendGrid, and dozens more
• Custom partner or legacy business systems

API Types & Protocols We Work With

REST (Representational State Transfer)

RESTful APIs are the backbone of modern web services — we design REST APIs that are resource-oriented, performant, and easy to consume from both frontend and backend applications.

RPC (Remote Procedure Call)

Whether you're using gRPC, JSON-RPC, or classic XML-RPC, RPC APIs are ideal for command-driven applications or microservices that need highly efficient communication.

SOAP (Simple Object Access Protocol)

Still in wide use across many enterprise platforms, especially in financial, insurance, and healthcare industries. We can parse WSDL files, construct structured SOAP requests, and integrate securely with complex legacy systems.

Why API Quality Matters

A poorly designed API leads to increased costs, frustrated developers, and long-term maintenance headaches. We focus on:

• Clear naming conventions and logical structure
• Error handling that makes debugging easier
• Rate limits, logging, and monitoring
• Test coverage and version control

Whether your API will be public, private, or partner-only, we’ll ensure it performs smoothly and evolves cleanly with your business.

Real-World Use Cases

• Connect a custom eCommerce platform to third-party fulfillment and inventory services
• Build internal dashboards that pull live data from multiple back-office systems
• Develop a partner API that exposes limited functionality to affiliates or B2B clients
• Extend a legacy system by building a modern API layer over outdated architecture