If you’re interested in making this like a real vending machines for services (beyond requesting files like Sats4Files), I would explore the S in ZKCSP:

IACR Cryptology ePrint Archive

Zero-Knowledge Contingent Payments Revisited: Attacks and Payments for Services

Zero Knowledge Contingent Payment (ZKCP) protocols allow fair exchange of sold goods and payments over the Bitcoin network. In this paper we point ...

They provide a way to pay for services in an atomically trust-minimized way, without either party trusting each other — but it doesn’t work over Lightning yet like Sats4Files.