Modern businesses run on connected software. AppOne designs and builds secure, well-documented APIs that let your systems share data cleanly — and we integrate the payment gateways, shipping providers, accounting tools and SaaS platforms you rely on.
We follow REST and GraphQL best practice, with versioning, authentication, rate-limiting and clear documentation, so your integrations are reliable today and easy to extend tomorrow.
What we deliver
Custom API Design
Clean, versioned REST and GraphQL APIs with authentication and rate-limiting.
Third-Party Integration
Stripe, PayPal, accounting, CRM, shipping and hundreds of SaaS platforms.
Webhooks & Events
Real-time, event-driven connections that keep your systems in sync.
Documentation
OpenAPI/Swagger docs so your developers and partners can integrate fast.
Why choose AppOne for API Development & Integrations
- Secure authentication with OAuth 2.0 and API keys
- Reliable retries, queuing and error handling
- Middleware to bridge legacy and modern systems
- Partner and public API programmes
- Monitoring, logging and usage analytics
Frequently asked questions
Can you integrate a service that has no API?
Often yes — through secure data exchange, file-based integration or carefully built automation where a service lacks a formal API.
Do you document the APIs you build?
Always. Every API ships with interactive OpenAPI documentation so it is easy to use and maintain.