what I did in Umbrel node was go to Lightning Node - advanced setting - routing, then enable the AMP.
route hints are like secret indications to the payer node to find the proper route to your private node (that is behind a LSP node)
Just tried and yes, it says you need to enable the LSP, so it can be a lazy way of opening a channel with the payer directly? 😂
In a payment your LSP is the last hop in that route hints. The LSP knows your nodeID and fw the payment to you through the private channel you have with. The LSP could be any other public node you are connected to.
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