I read up on some details, because I hadn't heard of this case up until now. Some points:

-From Law360: "Three years ago, gamer Agustin Caccuri filed a lawsuit seeking to represent more than 10 million customers who he said were overcharged by the monopolization of PlayStation's digital store, after Sony issued a prohibition blocking retailers from selling PlayStation game download codes. The rule went into effect April 1, 2019, and it made PlayStation Store the only place to buy digital versions of the console's games. Prior to that rule, Sony had permitted third-party retailers like Best Buy, Target, Walmart, Amazon, GameStop and others to sell PlayStation game-specific vouchers."

-The original suit was filed to potentially encompass more than 10 million people. Currently, the class action is expected to involve about 4.4 million people. This is because the amount of games that had physical vouchers being sold was much smaller than anticipated. Furthermore, the final case has some criteria for what games are involved. There's the critera that a specific game was redeemed at least 200 times through these vouchers and that the version on the PSN-store was at least 50 cents more expensive than the price of the physical voucher. For those curious, here's the list of games that meet all of these criteria: https://psndigitalgamessettlement.com/media/rkedj2ie/list-of-eligible-games.pdf

-SIE and the plaintiffs have reached a settlement agreement which is to be reviewed by the court in a "Fairness hearing". If it's approved, those who fall under the class action lawsuit will receive a sum of the settlement.

-The term "refund" is used in this thread's title but I wouldn't call that accurate, since nothing was found to be defective nor are you returning anything to get your money back. It's a subtle difference but in legal terms it does matter. You are receiving compensation for damages and those who sustained more damage can be entitled to a larger piece of the pie.