I've had a message to saying this... Nice one. You've just earned £5 Payback plus £10 bonus credit as a friend of yours has just activated their giffgaff SIM. Boom.
Unfortunately, I have not received £10 bonus credit neither the £5 payback. My friends both received £5 credit each, I on the other hand received nothing. When I log into my account it says 0 payback but says congratulations on your second activation why have I not received my reward for sharing the love?
With regards to your Payback; because (I'm assuming) the activations happened this month, then your tally will not show your earnings until next month, and in turn won't be redeemable until June.
How Payback works is that any points earned during a monthly period are totalled up and your points balance is updated around the beginning (give or take) of the following month.
Points therefore earned are then made redeemable in both June and December (when Payback is 'paid out'), so since we're fresh in a new Payback period, you have a few months yet to grab yourself some more points
Have a look-see at this handy guide detailing Payback and it's workings here: