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Third-party service

Exchange must obtain rates from an external provider. The provider is an implementation choice; the course exercise lists AwesomeAPI, ExchangeRate-API, Open Exchange Rates and CurrencyLayer as examples.

Adapter requirements

  • Configure the base URL and API key through environment variables.
  • Set a connection and response timeout.
  • Validate and normalize the provider response.
  • Cache rates only for a documented, short period.
  • Return an explicit error when the provider is unavailable or the currency is unsupported.
  • Do not log API keys or full provider responses when they contain sensitive data.