End-to-end recipe for adding a custom tab-bar action button: register the button definition (so admins can pick it), enable in admin, and implement the mam_main_add_tab_bar_item_{slug} filter for runtime population.

Step-by-step: register a sibling-plugin contribution to mam_get_phone_data_before_send. Pick the right priority, follow the JSON conventions, and integrate with the cursor cache mechanism.

How to bootstrap a MAM Suite sibling plugin only when mam-main is at the required version and the customer is entitled. Pattern: hook plugins_loaded at priority 11, check mam_check_required_version +…