Add a new value to the existing document Firestore - FLUTTER

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Fri Jun 17 2022 15:46:07 GMT+0000 (Coordinated Universal Time)

Saved by @jaystiqs #dart

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

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