Currently, there isn't a full API available for the Booking Calendar plugin. While some hooks do exist, they are not yet thoroughly documented. We are actively working on improving this and plan to include better documentation and a more comprehensive API in future updates to facilitate smoother integrations.

Despite the current limitations, the plugin does offer some useful functions and hooks that may serve your purpose. You can find these in the file located at `../wp-content/plugins/booking/core/wpbc-dev-api.php`. This file contains valuable functions and hooks that might be helpful for your specific needs.