Asking those intermediaries is against any ethos of Bitcoin.
Remember WHY Bitcoin was created in the first place:
> Abstract. A purely peer-to-peer version of electronic cash would allow online payments to be sent directly from one party to another without going through a financial institution.
You can run a simple self-custody / no intermediary PoS with ZEUS (npub1xnf…lpr5) on a simple tablet or even a phone, with an embedded LND/LDK node.
You do not need any other checkout software or intermediary like those you mentioned.