LUD-08: Fast `withdrawRequest`.

author: jackeveritt author: fiatjaf author: akumaigorodski discussion: https://github.com/fiatjaf/lnurl-rfc/issues/33#issuecomment-586706820

Fast LNURL-withdraw scheme

LN SERVICE and LN WALLET developers can also choose to implement a fast LNURL-withdraw. This implementation reduces the steps involved in the process by putting the data that would be sent by LN SERVICE in step 3. as query parameters of the LN SERVICE URL accessed in step 1., before it is bech32-encoded.

Eg:

https://LNserviceURL
?tag=withdrawRequest
&k1=String
&minWithdrawable=MilliSatoshi
&maxWithdrawable=MilliSatoshi
&defaultDescription=String
&callback=String

This fast LNURL-withdraw method is not to be confused as an alternative to the original LNURL-withdraw, and is designed to be only be used for lightning:-type links that work between apps. It is not suitable for QR code implementations.

If a LN SERVICE developer chooses to implement fast LNURL-withdraw in their app, the encoded URL with query params must still return a JSON response containing data that would be sent in step 3. when a GET request is made to it. This is required so as to be backwards-compatible with LN WALLETs which have only implemented the original LNURL-withdraw method.

Backwards compatibility

If a SERVICE chooses to implement fast LNURL-withdraw in their app, they will still need to support the standard LNURL-withdraw flow by expecting a WALLET that doesn't understand this scheme to just blindly send a GET request to the encoded URL.

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