import ch.codeblock.qrinvoice.model.QrInvoice;
import ch.codeblock.qrinvoice.model.builder.QrInvoiceBuilder;
final QrInvoice qrInvoice = QrInvoiceBuilder
.create()
.ultimateDebtor(d -> d
    .structuredAddress()
    .name("Pia-Maria Rutschmann-Schnyder")
    .streetName("Grosse Marktgasse")
    .houseNumber("28")
    .postalCode("9400")
    .city("Rorschach")
    .country("CH")
)
// ...
.build();