Nostr Web Client

For how long? How do you tell them apart or it vanishes after a few minutes?

As long as the invoice lasts or permanent for users with permanent lnurl address

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Who gets the badge the zapper or the receiver?

Isn't the profile pic soon full of badges and not visible?

The receiver. Maybe a yellow border instead?

Why yellow? Is the same from every zapper or unique?

Yellow as instant identification with lightning color for zap. Same for every receiving end.