{"ok":true,"data":{"domain":"example.dev","tld":"dev","available":false,"price":1700,"premium":false,"registerUrl":"/api/domains/example.dev/register","method":"POST","auth":"L402 (HTTP 402 + Lightning)","flow":["POST /api/domains/example.dev/register with { \"email\": \"you@example.com\" } (required)","Receive 402 with Lightning invoice","Pay invoice, get preimage","Retry POST with Authorization: L402 <macaroon>:<preimage>","If registration fails before settlement, retry the same paid request with the same credential","Receive 200 with management token"]}}