"Client calculates a recipient's lnurl pay request url from the zap tag on the event being zapped (see Appendix G), or by decoding their lud06 or lud16 field on their profile according to the lnurl specifications." From NIP-57. I wonder why its so specific and not allow client to use nip-47 nwc to get the invoice as well since its using nwc to make the payment 🤷‍♂️