@fabio @dansup @jwildeboer @Chocobozzz @thelinuxEXP @Techaltar
No, the $XMR field in profile is just a static address. The link to subscription page is just below that. This special page is only needed for compatibility with other software, and with FEP-0837 users don't need to leave their instance (that's the intent behind this FEP).
I should note that FEP-0837 does not require people to use digital currencies, it is designed to be currency agnostic, and even supports gift economy. The relevant part of the proposal is "Accepting an agreement" step:
>The finalized agreement MAY have url property containing one or more links to resources associated with the agreement. An example of such resource is a payment page (which can be represented as FEP-0ea0 link).
In other words, payment actually happens outside of protocol, and the recipient server sends a confirmation only when the payment is complete.
Transaction states were outside of scope of this FEP, but we can add them if necessary (it is still a draft).