This are all i know:

1) group summons(depending on damage ranking) plus some coupon bonus for killing the serpent..(dont know exact numbers)

2)nine tails invasion --- Rank 1- 60 coupons Rank 2- 45 coupons Rank 3-35 coupons(not sure) Rank 4-15(25 coupons)...killer gets 30 coupons extra.

3)Monthly card (best way to spend your money in this game)--get 300 coupons on getting a new card..and 50 coupons daily for 30 days

4)Convoy/ plunder..Plunder is more profitable. If you are relatively powerful in your server you could complete all 3 tries and get as much as 150 coupons daily. If you do convoy then 35 coupons/day, unless you use extra ingots to get more ss convoys.

5)If you have jonin medal you get 20 coupons daily for 6 months.

6)beating your best ranking in space time and ranked battle(2-4 coupons)

7)finishing all plot instances in a chapter with 3 stars.

8) acquiring certain number of ninjas.(sub plots)

9) cat quiz.-10 coupons for medium gift pack. if your bet on ninja succeeds you get more coupons.

10)Try your luck..use 10 ingots and get 20, 30 or 50 coupons

11) Group lucky wheel (10/20 coupons)

12)You have a probability of gettting coupons in trial vault(trial breakthrough)

13) Attaining arena ranks for first time.

This is all i remember.