Ok ... I'm clear about all but one thing here
6 Month + subscriber ---- One Cashout Card -- No Repeat
Plague Mission ---- One Cashout Card -- No Repeat
Butt off Mars Mission ---- One Cashout Card -- No Repeat
Digging ---- As many as yo can find -- Multipule repeats
The second method is by purchasing $100 of stuff, be it moves, radar upgrades, whatever. Every $100 spent entitles you to another Cashout Card.
Do subscriptions come in the 'whatever' category

? ... So after 13 months of subscription ( 7.99 * 13 = 103.87 ) I can claim a Cashout card ....... Then after another 13 Months of subscription I can claim another cashout card.
So , as a full time subscriber. I get
1 Cashout Card after 6 months subscription
1 Cashout card after ANOTHER 13 months of subscription
1 Cashout Card after ANOTHER 13 months of subscription
Have Fun
Mick