The direction is the opposite and it removes one step in the interaction. You can create this ln.cash code ahead of time and send it to someone over chat. That's it on your side - they can claim the money any time they want. Note that you are trusting ln.cash to not steal your money, so use it only for small amounts.
Wait, I thought making invoices also worked in 2 directions?
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There are some tricks like bolt-12, AMP, lightning addresses, but generally it's not that trivial.
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Until those are integrated everywhere, ln.cash fills the gap.
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