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CodeSignal

Tax API: Country-Based Rates and Checkout Snapshots

via CodeSignal

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Overview

Make tax a first-class part of the backend. You'll add a tax rates configuration API, allow carts to pick a tax country, and ensure checkout snapshots tax details onto orders so historical totals remain stable even when rates change.

Syllabus

  • Unit 1: Tax Rates Configuration
    • Review the repository, service, and resource routes for tax rates
    • Implement repository queries for tax rates
    • Implement validation and service functions for tax rates
    • Implement loader/action handlers for tax rates
  • Unit 2: Applying Country Based Taxes
    • Review how carts store tax_country and compute totals
    • Implement cart tax country validation and persistence
    • Resolve tax rate by country and compute cart totals
    • Implement the cart tax country action handler
  • Unit 3: Snapshotting Tax at Checkout
    • Review how checkout snapshots tax_rate_bps onto orders
    • Persist tax snapshot fields on the order at checkout
    • Snapshotting Tax at Checkout
    • Remove recomputation and rely on checkout snapshots

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