4M Sats - LNURL-Withdraw support (LN Wallet read LNURL-withdraw)

[pretyflaco]

Description

Implement LNURL-withdraw support which will allow user LN Wallet to read LNURL-withdraw QR or string to receive funds from a LN Service.

Background

Typically when a user wishes to receive sats, they generate an invoice, and that invoice is paid by the sender. In most user-facing b2c applications, it is pretty bad UX for the user to have to generate an invoice and then paste it into a service. This process is particularly tricky when users try to withdraw funds into mobile wallets while using a different device e.g. desktop website or Lightning ATM and have to communicate the generated invoice to LN Service.

The LNURL-withdraw flow standardises the communication of this LN invoice and payment of the invoice into a single UX action initiated by the LN Wallet.

Useful docs:
LUD-03
LUD-08
LUD-17
LNPay Docs
BOLT.FUN Docs

Task

Submit a PR that will allow users to receive funds to their account from LN Service by scanning a LNURL-withdraw QR or pasting LNURL-withdraw string

Definition of Done

PR gets merged and enables user to withdraw funds from LN Service by scanning LNURL-withdraw QR or pasting LNURL-withdraw string.

Bounty

4M Sats (0.04 BTC)

Bounty Patrons

Galoy

[kngako]

Anyone working on this?

[pretyflaco]

Thank you for the PR @kngako - it's currently in testing. Will update shortly.