Credit cards are a dying payment method. There is simply no advantage in using those anymore.
Younger generations (35 and under) will most likely not have a credit card at all because it's simply a relic of the past. Generally speaking, most people playing this game are simply using more modern payment methods. The only ones who still use credit cards most of the time are Russians and Americans. The former are legit players of course, the latter aren't too present in EuroAion.
Basically, what I'm trying to say is that most people have moved away from credit cards onto more modern and more convenient payment methods, the most popular of which is PayPal. You can easily see how most people got absolutely screwed over from the removal of PayPal if you watched the ECoin prices since then.
You just really gotta accept that PP is the payment method the majority of your players not only prefer, but is the only way they even could make a purchase.
We urgently need a solution.