Payment of "MIFI" bill with "mobiflous" service on my Ooredoo smartphone number

Hi Ooredoo !
I want to pay my "MIFI" bill of December 2018 before tomorrow,
So I decided to use mobiflous for the first time, i gone through all the registration steps successfully, but when I go to "payment de facture" i was asked to enter these informations (Saisissez le code organisme suivi de la référence suivi de la clé ) i know where to find the bill reference number . but I don't know what is the "code organisme" & "la clé" or where to find them. I can send you a photo of my bill's pdf file if possible through this site or by email to select the informations from it .
Thanks for your assistance !