i have Testnet LN Node, i have created a wallet, i have send on-chain funds to that wallet i have connected to several peers i have created several channels, all of these are outgoing one side funded channels,
i want to do a reverse submarine swap, i mean Pay in LN and receive in BTC
LN --> BTC
this site offers the other way https://submarineswaps.org/
the purpose of these is to reverse a channel, or the half capacity of channel to be ready to receive LN payments.
of course i could just spend money, but the idea is to reverse the channel without loosing money (loosing is simulated as its in testnet)