No, no, no. You sign up / register using your mobile, that's it, done. If you are one of those Facebook fiends, you can add that too
but it still needs your mobile in any event.
Nearly every App nowadays creates a unique QR code you use for various purposes, one purpose WeChat uses QR is
to add contacts, but there are more ways to add contacts too, I do not even know all of them. One basic way is a proximity
(simply standing near someone), couple clicks, done. And besides, no worries, the MPA will add you in 10 seconds,
just give her the phone and it will be done.
If you have not already downloaded WeChat beforehand, forget it.
If people are serious about doing away with difficulties making appointments, communicating directly with your "Chinese" MPA
I encourage you to download and try. WeChat has many other benefits too (voice, video calling to China or other places in the World)
only dinging you for data. Effective translation tool, not just text chats but even hand writing using / scanning photo's.