persistent active daily.. for F2P

online for certain time.. u can get 10 coupons per day

group summon 40 coupons x 2 per week, 80 coupons per week

weekend mission, do the hardest puzzle.. u can get 10 coupons x 2, 20 coupons per week

i do 3 SS convoy per day.. so 120 coupons per day.. i dont do plunder

others like what Bogotor said