Context Class

Following team conventions improves legibility and trust, while unexplained deviations harm maintainability. Frequent staging deployments reveal environment-specific configuration problems before production release pressure. A context can have its strategy set or swapped at any point. The context class holds a strategy reference and delegates work to it without depending on the specific strategy type. The context accepts a strategy and delegates payment processing to that strategy. Environment-specific values should be externalized so they do not need to be manually found before deployment.