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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).

Syllabus

  • Unit 1: Remix Checkout Implementation
    • Observe checkout flow from cart to order
    • Map checkout errors in the orders service
    • Implement createOrderFromCart transaction in the orders repo
    • Complete the checkout route action with validation and 201 responses
  • Unit 2: Retrieving Order Data
    • Observe listing orders and fetching an order by id
    • Implement GET /api/orders listing behavior
    • Implement GET /api/orders/:id data loading
    • Validate query params and ids in orders routes
  • Unit 3: Managing Order Transitions
    • Observe pay and cancel workflows for order status transitions
    • Update order status in the database and return the updated order
    • Validate allowed status transitions for pay and cancel
    • Complete POST /api/orders/:id/pay and POST /api/orders/:id/cancel routes

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