Worked on the Automattic/woocommerce-payments repository to enhance the robustness of address handling in Terminal Locations, specifically addressing cases where the store country was missing. Applied PHP backend development skills to implement a safe access pattern using the null coalescing operator, which prevented undefined index warnings and improved code reliability. Added targeted unit tests to ensure that an error is properly emitted when the country field is not set, thereby increasing test coverage and reducing edge-case failures. This bug fix improved payment routing stability for stores with incomplete address data, particularly benefiting scenarios such as those involving Puerto Rico, and reduced runtime warnings.