You should note that mining is a little more involved on a trial account.
On a paid account, you can learn to fly industrial ships, slap a mining laser on it and start mining while you alt tab and do other stuff on your PC while thats doing its thing, checking back every so often to see if you are full or if you need a new roid to mine. On a trial account you can't learn industrial ships, so you are basicaly stuck with frigates or cruisers, which means you can mount more mining lasers then an industrial ship so you can make more money, but the small cargo hold means every 5 min you have to fly to a station, transfer your ore to your hanger, then fly back out and repeat, unlike an industrial which can afk mine for 30min or sometimes even an hour if the roid is big enough.
Also, i am not sure if you can even use a game card on a trial account. The game itself is not 'free', the first time you set up a monthly subscription you get charged a bit extra to cover the cost of the game itself. I'm not sure how that would work if you get a gamecard, it could reduce the ammount of gametime it gives you to cover the cost, or it could simply not work at all untill you have payed for the cost of the game by a credit/debit card.
On a paid account, you can learn to fly industrial ships, slap a mining laser on it and start mining while you alt tab and do other stuff on your PC while thats doing its thing, checking back every so often to see if you are full or if you need a new roid to mine. On a trial account you can't learn industrial ships, so you are basicaly stuck with frigates or cruisers, which means you can mount more mining lasers then an industrial ship so you can make more money, but the small cargo hold means every 5 min you have to fly to a station, transfer your ore to your hanger, then fly back out and repeat, unlike an industrial which can afk mine for 30min or sometimes even an hour if the roid is big enough.
Also, i am not sure if you can even use a game card on a trial account. The game itself is not 'free', the first time you set up a monthly subscription you get charged a bit extra to cover the cost of the game itself. I'm not sure how that would work if you get a gamecard, it could reduce the ammount of gametime it gives you to cover the cost, or it could simply not work at all untill you have payed for the cost of the game by a credit/debit card.