And that the Wikipedia article discussing it is in fact wrong as well…
Sorry, there isn’t a lot of contemporaneous discussion referencing microtransactions on an arcade game that came out in the mid-90s… Back then, we paid up and complained about it to your friends or the person who had their coin on the table.
Basically, the gist is during game play, at specific breaks, you could have the opportunity to buy things like characters, combat abilities, infinit resources, etc.
Here you can even watch someone play the game. Miracle of the internet age, you can just open up a browser, type in “double dragon 3 arcade gameplay” and watch someone play the game and live the experience of being 10 years old in the 90s vicariously through someone else.
Or you could even download the PC port, or play it in emulation on your device of choice so you can truly see if those nasty first-hand accounts are telling the truth and you don’t have to question whether those people posting were knowledgeable, astroturfing, etc.
Or Fallout NV, or the Witcher series (witcher 3 has 450.unique books), or kingdom come deliverance.