Split clients by responsibility
Applications can use a focused client for email, contacts, conversations, or CRM. Shared HTTP and configuration concerns live in the abstractions layer.
← Architectural case studies
Reliable Business API Integration
A modular .NET integration layer for communication and customer-management APIs, with shared authentication and error handling.
The business problem
What the system needs to handle.
Connecting a business application to email and CRM APIs creates repeated work: authentication, request handling, response models, and failures. A reusable integration layer gives application teams a consistent boundary to work with.
Engineering scope
A shared integration foundation with focused clients for communication and customer-management operations, designed for dependency injection in .NET applications.
Architecture overview
One integration foundation, focused API clients
- Business application
- Typed clients & shared HTTP layer
- External service APIs
Key decisions
Where the design matters.
The choices that shape how the system can be changed, reviewed, and operated.
Expose failures the caller can act on
Typed exceptions distinguish rate limits and account-access failures from other API errors. Rate-limit timing is exposed to the caller; the application decides whether and when an operation should be retried.
Make integration behavior inspectable
ASP.NET Core sample APIs show how the clients fit into an application. Tests cover request handling and specific failure paths, including rate-limit and payment-required responses.
Implementation
What has been implemented.
- A shared HTTP foundation and focused clients for different API responsibilities.
- Tests for shared HTTP behavior and individual API clients.
- Sample applications demonstrating integration with an application host.
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