Option for Users to Pay with Credits

It would be good if there was an option for users to buy credits/coins and pay for items with those credits. People can use credits to buy different kinds of digital items that offer payment with credits. They can also choose to donate credits to other users. Credits can be purchased in a specific amount, or users can subscribe to receive a certain number of credits each month (possibly with a discount if they choose the monthly subscription). Credits may be used to buy different things in the platform, but each seller may choose how many credits they want to charge for each product that they're selling. Some products may be purchased fully with a set number of credits. However, other products might have multiple parts to them, and are constantly being updated, so each part may need to be unlocked individually with a certain amount of credits.

Take a look at the image I have attached to see an example of what this may look like.