how do i us the "gift card"

In the store, Right click on a card, then select use Gift card.

On the Card Slide out, use the small drop down arrow and change the payment from credits to gift card.

Same on the card details view, use the small arrow dropdown to change the payment from credits to gift card.

how do i get Joker cards?

Jokers are obtained by participating in some of the TGIF events.
read the Info about the Event as Not every event includes jokers as a possible reward.

They are Elusive though, not often won.


Also, they are sometimes offered as a Reload Bonus.
we have seen a 1000 credit reload offer a Joker as a bonus in the past,
and most Recently the 2500 reload had offered a Bonus Joker.
This one might be coming back, it was suspended when the Black Friday Events started.