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As with Player Invite Prompts, you must create and edit your notification strings in the Creator Dashboard. There is no default game notification string, so this step is required.

Navigate to the Creator Dashboard.
Similar to badges, notification strings are tied to a specific game. Locate that game's thumbnail and click on it.
In the left column, under Engagement, click Notifications.
In the center region, click the Create a Notification String button.
Fill in an identifier name (only visible to you) and the custom notification string; this is limited to 99 characters and can include unlimited custom parameters. Notifications will automatically use the title of your game as the notification title, but you can additionally use {experienceName} to reference your game in the notification body text.

Example notification strings:

Note

Before writing notification strings, please review the guidelines for using the system.

When ready, click the Create Notification String button.
On the notifications page, in the table of notifications, click the ⋯ button in the Actions column and select Copy Asset ID.
Use the copied ID for the messageId key value in the payload table as demonstrated in the example script.