SPmHelper

Players open the main menu with a default key, then go to Settings to configure their cards. Once a card is selected, the action card can be chosen to make a payment from a join-world session on the SPm server. The payment menu has its own default key, and it asks for a recipient card, a username and an amount between 1 and 10,000 AR.

Payments can also be made through a sign. A player places a sign on the SPm server and writes the text that identifies a payment request, including the recipient's card number and an optional comment attached to the payment. A faction can be called through the same helper, and authentication is completed by pressing the auth button and running the spmhelper auth command.

Cloth Config API is required, and Mod Menu is optional. Files are published for Fabric only, for 1.21 and 1.21.1, with 0.6.2 for 1.21.1 as the latest build. Only the client needs the mod, and it is released under the MIT License as open source.