Withdraw from a LNURL-withdraw string.
To use this endpoint, decode a LNURL-withdraw QR code and perform a /GET request on the decoded url to get the JSON response. Then, ask the user for an exact amount to withdraw (if necessary). Then, call this api with the necessary parameters
The bolt11 returned is for tracking purposes. As per the protocol, the bolt11 is supposed to be paid asynchronously; therefore caller of this api is responsible for tracking the payment status of the bolt11