Notification infrastructure for modern mobile apps

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// Register multiple devices for a given user. Notifications
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// will be delivered to each device in a single send call
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{
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  "tokens": [
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    {
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      "token": "abc123",
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      "provider_key": "apn",
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      "properties": {
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        "test": true
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      },
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      "device": {
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        "app_id": "com.my.app",
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        "platform": "iOS",
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        "model": "iPhone 13"
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      }
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    },
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    {
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      "token": "cba321",
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      "provider_key": "firebase-fcm",
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      "tracking": {
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        "ip": "127.0.0.1",
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        "lat": "0.0",
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        "long": "123"
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      }
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    }
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  ]
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}