The externalNr is the unique identifier for the customer in datenstrom and is required for all operations.

example usage of the datenstrom api

let service = new CustomerApi("<api_key>","https","<url>",443);
let ret = await service.createOrUpdate([
    new CustomerApiVO({
        externalNr: "123",
        bezeichnung: "Test",
        address: "Testadresse",
        location: "Testort",
        zip: "1234",
        country: "Osterreich",
        email: "[email protected]",
        iban: "AT123456789",
        bic: "bic",
        bank: "Testbank",
        uid: "ATU12345678",
        bhKonto: 123456789,
        fibuType: FibuCustomerType.INLAND,
})]);