Không được dùng nữa
[[["Dễ hiểu","easyToUnderstand","thumb-up"],["Giúp tôi giải quyết được vấn đề","solvedMyProblem","thumb-up"],["Khác","otherUp","thumb-up"]],[["Thiếu thông tin tôi cần","missingTheInformationINeed","thumb-down"],["Quá phức tạp/quá nhiều bước","tooComplicatedTooManySteps","thumb-down"],["Đã lỗi thời","outOfDate","thumb-down"],["Vấn đề về bản dịch","translationIssue","thumb-down"],["Vấn đề về mẫu/mã","samplesCodeIssue","thumb-down"],["Khác","otherDown","thumb-down"]],[],[],["C2DM was deprecated on June 26, 2012, and shut down on July 30, 2015. Developers who were using C2DM should migrate their applications to Firebase Cloud Messaging (FCM). The shutdown of C2DM marked the end of its service, while FCM is the current suggested replacement for developers to use.\n"]]