document push type and priority keys for notifications

_includes/parse-server/push-notifications.md

@@ -20,6 +20,8 @@ We support most of the sending options. Check the detailed doc [here]({{ site.ba
 
 * `channels` to target installations by channels
 * `where` to target installations by `ParseQuery`
+* `priority` under `data` for iOS push priority
+* `push_type` under `data` for iOS push type
 * `alert` under `data` for notification message
 *  number `badge` under `data` for iOS badge number
 * `sound` under `data` for iOS sound
@@ -284,6 +286,8 @@ If you're interested in any of these features, [don't hesitate to jump in and se
 
 If you are seeing situations where silent notifications are failing to deliver, please ensure that your payload is setting the `content-available` attribute to Int(1) (or just 1 as in javascript) and not "1". This value will be explicitly checked.
 
+When sending a push notification to APNs you also have to set `push_type` to `background` for delivering silent notifications to devices running iOS 13 and later, or watchOS 6 or later.
+
 ### PPNS
 
 * [PPNS Protocol Specification (for Parse IoT devices)](https://github.com/parse-community/parse-server/wiki/PPNS-Protocol-Specification)

_includes/rest/push-notifications.md

@@ -620,7 +620,9 @@ If you want to send more than just a message, you can set other fields in the `d
 *   **`alert`**: the notification's message.
 *   **`badge`**: _(iOS only)_ the value indicated in the top right corner of the app icon. This can be set to a value or to `Increment` in order to increment the current value by 1.
 *   **`sound`**: _(iOS only)_ the name of a sound file in the application bundle.
-*   **`content-available`**: _(iOS only)_ If you are a writing an app using the Remote Notification Background Mode [introduced in iOS7](https://developer.apple.com/library/ios/releasenotes/General/WhatsNewIniOS/Articles/iOS7.html#//apple_ref/doc/uid/TP40013162-SW10) (a.k.a. "Background Push"), set this value to 1 to trigger a background download.
+*   **`content-available`**: _(iOS only)_ If you are a writing an app using the Remote Notification Background Mode [introduced in iOS7](https://developer.apple.com/library/ios/releasenotes/General/WhatsNewIniOS/Articles/iOS7.html#//apple_ref/doc/uid/TP40013162-SW10) (a.k.a. "Background Push"), set this value to 1 to trigger a background download. You also have to set `push_type` starting iOS 13 and watchOS 6.
+*   **`push_type`**: _(iOS only)_ The type of the notification. The value is `alert` or `background`. Specify `alert` when the delivery of your notification displays an alert, plays a sound, or badges your app's icon. Specify `background` for silent notifications that do not interact with the user. Defaults to `alert` if no value is set. Required when delivering notifications to devices running iOS 13 and later, or watchOS 6 and later.
+*   **`priority`**: _(iOS only)_ The priority of the notification. Specify 10 to send the notification immediately. Specify 5 to send the notification based on power considerations on the user’s device. ([More detailed documentation](https://developer.apple.com/documentation/usernotifications/setting_up_a_remote_notification_server/sending_notification_requests_to_apns))
 *   **`category`**: _(iOS only)_ the identifier of the [`UNNotification​Category`](https://developer.apple.com/reference/usernotifications/unnotificationcategory) for this push notification.
 *   **`uri`**: _(Android only)_ an optional field that contains a URI. When the notification is opened, an `Activity` associated      with opening the URI is launched.
 *   **`title`**: _(Android only)_ the value displayed in the Android system tray notification.