setCustomerUserId method
Set — or clear — the customer user id after configure
A null or blank id is an explicit clear here, not "not provided".
Implementation
@override
Future<void> setCustomerUserId(String? customerUserId) async {
// The key is always sent, holding null on a clear.
await methodChannel.invokeMethod<void>('setCustomerUserId', {
'customerUserId': customerUserId,
});
}