Video game RPGs often have little minigames for things like this, with your stats helping you manipulate the game in some way. KCD, for example, doesn't have any stats which help you, but you can acquire cheat dice to improve your odds.

It could be fun to play a session like this at the table. Actually play a game of poker or blackjack or something against NPCs, and let players make rolls to help. Some thoughts (using PF2 skill actions):

• Palm an Object (thievery): swap your given card for one you've hidden on your body (requires establishing ahead of time that you've got cards hidden)
• Lie (deception): convince your opponent to bet big when you have a strong hand, or to fold when your don't (DC scales with how good their hand is)
• Create Forgery (society): if they use some unusual or non-standard cards that you couldn't just buy, use this to create your own set for use with Palm an Object. If you're bringing your own full deck you can also subtly mark the back of cards so you know what they are.
• Perception: spot the card that has been dealt
• Perception: read an opponent to see if they're bluffing

I might also allow some sort of intelligence check to do things like knowing your odds of winning, or to automate blackjack card counting, especially if the characters would be better at that than the players are.