How does the pay join feature work? It looks like it uses a callback URL, who hosts that URL and how does it know about your utxos?
Discussion
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PayJoin only worth's with other wallets which allow PayJoin. So if you make an on-chain transaction from one BULL Wallet to another BULL Wallet. Also Bull Bitcoin was the first exchange to enable PayJone since late last year. So it you send on-chain transaction from your Bull Bitcoin exchange account to you BULL Wallet, PayJoin will is enabled by default.
