Managing versioning and backward compatibility in financial service APIs involves careful planning and communication. Using semantic versioning helps indicate changes' impact on compatibility. Techniques such as URL versioning or header-based versioning allow clients to specify which API version they consume. Implementing clear deprecation policies and maintaining backward compatibility via gradual phase-out of outdated features ensure smooth transitions for users. Thorough testing, documentation updates, and communication with stakeholders are essential to minimize disruptions while evolving API functionalities in a regulated <span style="font-size: 11pt; font-family: Arial; text-align: center;" data-sheets-root="1" data-sheets-value="{"1":2,"2":"fintech software developers"}" data-sheets-userformat="{"2":1321793,"3":{"1":0},"9":1,"11":4,"12":0,"14":{"1":2,"2":0},"16":11,"21":0,"23":1}" data-sheets-hyperlink="https://smr.seotooladda.com/analytics/keywordoverview/?q=fintech%20software%20developers&db=in">fintech software developers</span> environment.