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FCM Message Delivery Report

I know that after sending the message, Google will send back the message identifier, and this does not mean that the message has already been delivered to the device.

In any case, to receive delivery reports of sent notifications to FCM?

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Yes, message_id only indicates that the message was successfully delivered to FCM servers.

I think you are looking for sales revenue :

Receiving delivery . If the application server has delivery_receipt_requested enabled in the downstream message, the XMPP connection server sends a delivery receipt when it receives confirmation that the device has received the message.

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Source: https://habr.com/ru/post/1258406/

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