getCustomer method
Implementation
Future<Customer> getCustomer({String? customerId, String? externalId}) async {
const name = Aufrufe.getCustomer;
_genauEine(name, {'customerId': customerId, 'externalId': externalId});
final daten = await _transport.call(name, {'customerId': ?customerId, 'externalId': ?externalId});
return _lesen(name, () => Customer.fromJson(_objekt(daten, 'customer')));
}