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A good explanation from a Reddit user:
An LNURL-pay is a link that wallets use to fetch an invoice from a server on-demand. So:
You scan a QR code, which is not a Lightning Invoice but LNURL-Pay string.
Your wallet connects to the URL from string above, usually over HTTPS.
After that, there is usually a dialog where you can set an amount (or sometimes it's fixed).
Your wallet tells the service, that you want to pay for example 1000 satoshi.
And now, the service will generate regular Lightning Invoice for 1000 satoshi and send it to you.
You wallet will pay this invoice in a classic way.
ZeusLN doesn't use lnurl-pay for this, they use AMP invoices, which expire, unlike most lnurl paycodes. You can learn more here.
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