Today we received a message about a top up offer using the Paymentwall method of payment. Making any purchase by this method you will receive 20% more stardollars
I don't know if this method is available to all countries, but I am from Brazil and received it and according to some comments on last post it is available in Argentina and Mexico too (thanksAbrilM22 and Arwin_linda)
UPDATE: The offer is also available in Russia (special thanks to NoRegrets07)
It is available in Croatia (special thanks to lorenamatesa123)
For what I saw, checking in payment page, Paymentwall is available in many countries:
Will you be using this offer to buy more Stardollars or buy a SS membership?