OK! I am stuck here. I have almost rewritten the elitpay plugin to work with fortumo. The only problem is that I can't extract the itemId variable only. Maybe I will use explode because $itemnumber = 101x$category_Idx$itemId weird. I want to make it like this. Users send sms with $keyword $itemId to get their ads published / or make them premium. The other weird thing is that when the SMS is sent, the item does not open. An error message appears and says "This item is not available", but it appears on the listings. Just the plugin does not allow the link to the item to open. When the plugin is disabled, items can't be opened, either, nor could they be deleted or anything else. Can't even delete them through php myadmin.
Actually this is the bigger problem... Any help?
I also found this but does not work, nor know I how to configure it. Haven't checked the way it was written, yet.
http://code.google.com/p/osclass-fortumo-payment/