Hello! Try different approaches also, you can decide what tracking method you want to try after that, as there are many approaches that one can use to effectively do so.
For additional information on setting up a tracking system to suite your needs, please see: https://www.sfimg.com/PowerTools/KeyCodeTracking
The best way is to define some of your own numbers such as 1201 for facebook ad, 1202 for sms promotion of your SFI gateway.
Have a nice day!