jm µñæ&¯+ð%TÒMqÞÙù¶iìEwS¦On}dBDÌLAhhh. 402 initiates payment, then crypto is used for that payment. Yeah, I see your point now. I guess BIP70 supercedes the HTTP402 in this case
https://whatsonchain.com/tx/be22991014c74d10fa3dc05dc56ef38a3528710b6f1e5a93e6c8a9abf5273388