As changes are made to Blesta, there comes a time where some old data and functionality are no longer useful and need to be removed. These removals can adversely affect your custom development or source code changes, such as through plugins or API calls. We make as much effort as possible to maintain backward-compatibility for deprecated functionality, but you should keep up-to-date with these changes to prepare and update your custom source code accordingly. To keep you apprised of things we intend to remove, please refer to the Deprecated Functionality documentation.