In this thread today:
Three important notes
Making sure you are eligible for Payback: You should be an active member (eg you have an active SIM prior to the end of the Payback period, or have used the giffgaff money site).
So is this now official, to receive payback you do not need an active SIM, merely to have used the giffgaff money site.
... and what constitutes used in this context, to have visited the site or made a purchase through the site, or signed up for the credit score or ...?
Seem to remember we've had this discussion before, but without an answer.