Has anyone gotten nostr:npub1lnm0ac8ft8r3jhddchekledgwvqrkwy7wqejjwcxq47gy87te8zs6utnnn LNURL callbacks to work? I've manually done my own LNURL auth, but their callback asks for an HMAC.
I thought you only needed the k1 (provided by me), signature and publickey (provided by wallet) to confirm a signature?
(it also wants an HMAC and tag)