I just went to self-serve to find out when exactly i joined PM. Well, i didn't find the date listed anywhere. Only way i figured it out is by looking at my very first payment transaction date. If someone joined couple years ago and had no clue when exactly they joined, it would not be simple to find out. For sure overtime they are tracking on getting loyalty rewards and they might remember the date.
So, it would be better if you just show the date under my profile on overview page.
Something like this: