@thelinuxEXP @dansup @jwildeboer @Chocobozzz @fabio @Techaltar
A mechanism for federated payments was proposed in FEP-0837: https://codeberg.org/fediverse/fep/src/branch/main/fep/0837/fep-0837.md
It should work with any currency and in any kind of application. I'm already using it to facilitate subscription payments in my own project.