You should be able to log into the app, enter someone's phone number and send them a text message they can use to 1) install the app, if need be, and then 2) create their account. From the user's perspective this is an easier way of doin' it than remembering user names or remembering to even put it in, etc.
They could even indicate which promotion you are 'claiming' them for. Or other things like that that we think of associated with a phone number.
You should be able to log into the app, enter someone's phone number and send them a text message they can use to 1) install the app, if need be, and then 2) create their account. From the user's perspective this is an easier way of doin' it than remembering user names or remembering to even put it in, etc.
They could even indicate which promotion you are 'claiming' them for. Or other things like that that we think of associated with a phone number.