Thanks for using it and pointing that out! You’re right — the transport field is missing, and I’ll fix that. I’m planning to add "t" as an empty array for now, since L402 currently uses an implicit transport method via X-Cashu headers. However, I’m open to discussing whether we should introduce explicit transport methods (like Nostr or HTTP POST) for receiving eCash, though that might add unnecessary complexity to the otherwise simple L402 protocol.