var collection = FirebaseFirestore.instance.collection('collection'); collection .doc('doc_id') .set({'payment_customer_id': customerResponse!.data.customerId, }, SetOptions(merge: true)); // <-- Set merge to true.
var collection = FirebaseFirestore.instance.collection('collection'); collection .doc('doc_id') .set({'payment_customer_id': customerResponse!.data.customerId, }, SetOptions(merge: true)); // <-- Set merge to true.