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API / APIGEE Gateway Interview Questions

What is an API Product in Apigee and how does it differ from an API Proxy?

An API Product is a curated bundle of API proxy resources combined with a usage plan. It is the unit that developers subscribe to, and it represents how you monetise or control access to your APIs. A single API proxy can be included in multiple products with different entitlements.

API Proxy vs API Product
AspectAPI ProxyAPI Product
What it isThe technical proxy configuration that handles request/responseA business-facing package of API resources with access rules
Who configures itAPI developers / platform engineersAPI product managers
ContainsProxyEndpoint, TargetEndpoint, policies, flowsOne or more proxies, specific resource paths, environments, and quota settings
Developer seesNever directly (transparent)Visible in developer portal; developer subscribes to it
PurposeTransform, secure, route trafficPackage, monetise, and control access to API capabilities
<!-- API Product configuration (conceptual) -->
API Product: "Premium Weather API"
  - Proxies:        weather-proxy
  - Environments:   prod
  - Resource paths: /current, /forecast, /historical
  - Quota:          10,000 calls/day
  - Approval:       automatic

API Product: "Free Weather API"
  - Proxies:        weather-proxy
  - Environments:   prod
  - Resource paths: /current  (forecast and historical NOT included)
  - Quota:          100 calls/day
  - Approval:       automatic

# Same proxy, different products = different entitlements per tier
# Developer creates an App, subscribes to a Product,
# receives a consumer key tied to that product's quota

This separation of concerns is powerful: the API proxy implementation stays the same while the product layer defines which paths, environments, and rate limits apply to each developer audience.

A company wants to offer a Free tier with 100 calls/day and a Premium tier with 10,000 calls/day using the same backend API. What Apigee feature enables this without duplicating the API proxy?
Who typically subscribes to an API Product in the Apigee model?

More Related questions...

What is Apigee and what problem does it solve for organisations? What are the deployment models available in Apigee? What is an API proxy in Apigee and what are its main components? What are Flows in Apigee and what is the request/response processing pipeline? What are Apigee Policies and what categories are available? What is the VerifyAPIKey policy and how does basic API key security work in Apigee? How does OAuth 2.0 work in Apigee and what grant types are supported? What is the difference between Quota and SpikeArrest policies in Apigee? What is an API Product in Apigee and how does it differ from an API Proxy? What is the Apigee organisation hierarchy and what are Environments? What are Shared Flows in Apigee and when do you use them? What is response caching in Apigee and how do you configure the ResponseCache policy? What is the AssignMessage policy and what can it do? What is the ExtractVariables policy and how does it work with flow variables? What is the ServiceCallout policy and when would you use it? What are Key Value Maps (KVMs) in Apigee and how do you use them? How does fault handling and error management work in Apigee? What is Target Server configuration in Apigee and why is it used instead of hardcoding backend URLs? What analytics capabilities does Apigee provide? What is the Apigee Developer Portal and how does it support the developer experience? How does JWT validation work in Apigee? What is the MessageLogging policy in Apigee and how is it used for audit and debugging? How does Apigee handle CORS (Cross-Origin Resource Sharing)? What is the Apigee hybrid architecture in more depth, including its components? What are Environment Groups and how does routing work in Apigee? How does TLS and mutual TLS (mTLS) work in Apigee? What is the Access Control policy in Apigee and how do you allowlist/denylist IPs? How do the JSONToXML and XMLToJSON policies work in Apigee? What is GraphQL proxy support in Apigee? What is Apigee CI/CD and how do you deploy proxies in a pipeline? What is RBAC (Role-Based Access Control) in Apigee and what are the built-in roles? What is Advanced API Security in Apigee and how does it detect bot attacks? What is Apigee API Hub and how does it relate to Apigee gateway? How does load balancing and health checking work on Apigee TargetEndpoints? What is the Apigee Debug / Trace tool and how do you use it for troubleshooting? How do you import an OpenAPI specification into Apigee to generate a proxy? What is Apigee monetisation and how does it work? What are Apigee flow variables and how do you work with them? How does Apigee compare to other API gateways such as Kong, AWS API Gateway, and MuleSoft? What are common Apigee anti-patterns and best practices for production deployments?
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