This features JEEMA SMS to use Interswitch (http://www.interswitchng.com/) as one of the payment plugin to purchase SMS packages. This was developmed mainly to meet nigerian customer requirements.
Interswitch is one of the best payment gateway in Nigeria. This plugin enables JEEMA SMS to use Interswitch is one of the payment gateway. So, your Joomla members can use this gateway to purchase SMS packages.