Skins donations for Ragnarok Online servers

Nothing. The donation module is free to download and use. SkinsFlow charges 2.5% of each payment credited to your balance, and nothing else: no setup fee, no monthly fee, no minimum volume. Failed, expired and returned payments cost nothing.

The module runs on its own page and only needs your game database, so it can sit next to FluxCP or any other control panel.

Steam can hold traded items for up to 7 days and return them to the customer in that window. A protected payment is not counted as paid yet: points are credited when the hold ends. When the hold ends the payment completes on its own, or you can release it early in your SkinsFlow dashboard if you trust the customer.

Most emulators read cash points when the cash shop opens, so logging out is not needed. If yours caches them, a relog shows the new total.

Yes, when players receive points or items in return. You need the right to run your server and sell what you offer.

Yes. Turn on test mode and use your project's test secret. The checkout then shows real items with real prices but no item and no money moves, and buttons let you play every outcome: paid, protected, returned, declined. Use a test account to check delivery.