Upgrade from Version 3 to 4 Method Name Changes Some method names have changed. Old methods have become obsolete. IFirestore Version 3 Version 4 GetCollection Collection GetDocument Document GetCollectionGroup CollectionGroup CreateBatch Batch ICollectionReference Version 3 Version 4 CreateDocument Document GetDocument Document AddDocumentAsync AddAsync IDocumentReference Version 3 Version 4 GetCollection Collection GetDocumentAsync GetAsync SetDataAsync SetAsync UpdateDataAsync UpdateAsync DeleteDocumentAsync DeleteAsync IQuery Version 3 Version 4 GetDocumentsAsync GetAsync ITransaction Version 3 Version 4 GetDocument Get SetData Set UpdateData Update DeleteDocument Delete IWriteBatch Version 3 Version 4 GetDocument Get SetData Set UpdateData Update DeleteDocument Delete Namespace Changes A namespace has changed. Version 3 Version 4 Plugin.CloudFirestore.Extensions Plugin.CloudFirestore.Reactive