Paulo Miranda

Notifications for posts, pages and custom post types.
Works with scheduled posts.
Send notifications to users of your app from your website using Google’s service, Firebase Push Notification.
The notification sent includes the block with the data message to be handled by the application, even when it is in the background.
Configure the plugin to start sending notifications.
Send custom field values ​​in the notification, in the data option.
Send a notification when you post news or update your content. When editing, the option is deselected to send you to accidentally send a new notification. Check if you want to send a new notification when editing.
Compatible with apps developed with the SDK Flutter.
You need to register users on the same topic (fcm) that was informed in the plugin configuration. This plugin is not intended for sending notifications to websites.
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FCM Push Notification from WP

Notify your users using Firebase Cloud Messaging (FCM) when content is published or updated.

Proficient Designers

pd Android FCM Push Notification is a plugin through which you can send push notifications directly from your WordPress site to android devices via <a href='https://firebase.google.com/' rel="nofollow ugc">Firebase Cloud Messaging</a> service. When a new blog is posted or existing blog is updated, a push notification sent to android device.
Features Included:
<ul>
<li>Can send push notification for each blog post.</li>
<li>Even can send custom notifications to the registered devices.</li>
<li>Devices are subscribed in category wise, so that the notifications can also be sent based on the category.</li>
<li>Featured image support is available (above android version 4.4).</li>
<li>Push notifications can be scheduled.</li>
<li>A checkbox is available at the right side to choose whether to send push notification in post publish or update.</li>
<li>For more documentation and screenshots, please visit <a href="https://proficientdesigners.in/creations/pd-android-fcm-push-notification/" rel="nofollow ugc">proficientdesigners.in</a></li>
</ul>
Demo: 
<iframe loading="lazy" class="youtube-player" width="750" height="422" src="https://www.youtube.com/embed/_fffaw9fFwY?version=3&rel=1&showsearch=0&showinfo=1&iv_load_policy=1&fs=1&hl=en-US&autohide=2&wmode=transparent" allowfullscreen="true" style="border:0;" sandbox="allow-scripts allow-same-origin allow-popups allow-presentation allow-popups-to-escape-sandbox"></iframe>
Using 3rd party service:
Please note that this plugin is relying on a 3rd party service, which is the Google Firebase Cloud Messaging service (FCM) and your data is being sent through their servers via HTTP API (https://fcm.googleapis.com/fcm/send). This is very legal to use the Google Firebase Cloud Messaging service (FCM), based on their terms and conditions <a href='https://firebase.google.com/terms/' rel="nofollow ugc">https://firebase.google.com/terms/</a>.
Demo Android App: 
We have a demo android app in the Google Play Store for this plugin’s testing purpose. You can get the link from our official documentation page.

pd Android FCM Push Notification

pd Android FCM Push Notification is a plugin through which you can send push notifications directly from your WordPress site to android devices via Fi …

FCM Push Notification from WP vs pd Android FCM Push Notification