Quote from: Pmalek on Today at 09:43:17 AM

I can conclude that the grocery store would be able to receive Lightning payments as soon as the channel was opened.

Correct.

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But I have to be the one who opens the channel, not them?

A channel gets funded when it gets opened, so it makes sense to be opened by the person who has to pay the other person.

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Sending payments in the opposite direction would in this scenario not be possible. The grocery store can't send me anything, because "my bottle is full" and I first have to empty it by sending funds to them.

Correct. But as a customer buying groceries, that should be fine. If you're a supplier selling something to the store it's a different story.

However, if a supermarket accepts Bitcoin Lightning payments, they'll most likely use a payment processor to handle the transaction. So you can open a channel to any well-connected node, and the shop doesn't have to worry about anything.