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CodeSignal

Orders API: Checkout Workflow and Order State Transitions

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Overview

Finish the backend with checkout and orders. You'll convert carts into orders transactionally and implement order listing plus state transitions (pay/cancel). The last unit aligns the code with the full course outcome.

Syllabus

  • Unit 1: From Cart to Order
    • Observe checkout creating an order
    • Implement minimal transactional checkout
    • Validate and decrement inventory during checkout
    • Compute tax + totals for the created order
  • Unit 2: Listing and Fetching Orders
    • Observe list + detail order reads
    • Implement GET /api/orders with pagination
    • Implement GET /api/orders/:id detail endpoint
    • Implement listOrdersService + getOrderService
  • Unit 3: Paying and Cancelling Orders
    • Observe pay/cancel transitions
    • Implement payOrderService transition
    • Implement cancelOrderService transition
    • Wire pay/cancel routes with validation + envelopes

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