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: "test@email.at",
iban: "AT123456789",
bic: "bic",
bank: "Testbank",
uid: "ATU12345678",
bhKonto: 123456789,
fibuType: FibuCustomerType.INLAND,
})]);