.amount(Amount::Currency { iso4217_code: *b"USD", amount: 100 })
.build_unchecked()
.request_invoice(vec![0; 8], payer_keys.public_key()).unwrap()
.amount(Amount::Currency { iso4217_code: *b"USD", amount: 100 })
.build_unchecked()
.request_invoice(vec![0; 8], payer_keys.public_key()).unwrap()