The scenario
An e-commerce order placement API receives a request and must authenticate, validate, check inventory, authorize payment, create the order, and return the appropriate HTTP response.
What is in this drawing
Read the decisions behind it.
01
Is the API key valid?
02
Is the JSON payload valid?
03
Is inventory available?
04
Is payment authorized?
Reusable for any order placement or checkout API flow that requires authentication, validation, inventory checking, and payment authorization before order creation.
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