Hi, There is a way of sending SMS for every action (check out, check in etc.,) from Koha. Many SMS gateways provide APIs in the form of HTML. It is given in the form of url for which you have to buy service and they provide you with login and password. The url requires the patron mobile number and message (koha action as check out, check in etc., ). Once you have all the inputs execute the same using "curl". It works. You can have a script of your own and make it as a cronjob activity. Regards, Somasekhar Rao K