How to enable SMS service in OpenEMR

Thank’s. I live in Argentina, and here the costs are very expensive. Do you know a way that email notification works using mercury server?. I have followed the wiki tutorial and managed to make mercury work, but I don’t know how to configure the openemr part to use mercury for sending notifications. I do not know if in the part of the mails I have to put the data of the gmail client that I use or another to use mercury. On the other hand, with the gmail data in globals / notifications, it sends the emails to the portal users. I do not know why it is so complicated. I don’t use sms because here it is extremely expensive. I will thank you if you can guide me.
Regards