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The panel below shows how different would be a choice foe Android and iOS users.

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The difference here is that iOS devices are incapable of sending Push into browser, which is compensated by a choice of mobile messengers. Android 

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{
"applicationId": 1,
"extId": "100500",
"title": "Hello",
"message": "It`s message about your order#order.#"
}

Where:

"applicationId" - is the same ID which you see in your long links

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For authenticating your sending party you can use static basic auth keys, which you can find here:

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Or dynamic JWT keys, which you can find here:

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