HTTPでFCM Push通知送信方法（legacy http server protocol）

Firebase Cloud Messaging HTTP Protocol
https://firebase.google.com/docs/cloud-messaging/http-server-ref

PowershellでFCM　Push通知送信

$SERVER_KEY='abc...'
$DEVICE_TOKEN='123...'

$JSONBODY=@"
{
    "to": "${DEVICE_TOKEN}",
    "data": {
        "url": "https://yahoo.jp"
    },
    "notification": {
        "title": "a title",
        "body": "a test message"
    },
    "priority":10,
    "mutable_content":true
}
"@

$AuthHeader=@{'Authorization'="key=${SERVER_KEY}"}
$Url= 'https://fcm.googleapis.com/fcm/send'
$Response=Invoke-RestMethod -Verbose -Method Post -Uri $Url -Headers $AuthHeader -ContentType "application/json" -Body $JSONBODY

$Response