Step 1: Head over to OneSignal and sign up if you haven't already.

Step 2: After logging in, hit "Add App" to start a new application for push notifications.

Step 3: Give your app a name and pick the right platform (iOS, Android, or Web Push).

Step 4: If you're working with a web-based Adalo app, choose Web Push. Then, decide between a typical website or custom code integration, depending on what your app needs.

Step 5: When asked, generate an API Key. You'll need this later for Adalo.

Step 6: Finish the setup wizard, enter your website details, and tweak the notification prompt to your liking.

Step 7: Go to the "Settings" page in the OneSignal dashboard.

Step 8: Head to "Keys & IDs" and keep the "Rest API Key" and "App ID" handy. You'll use these in Adalo.

Step 9: Log in to your Adalo account and open the project where you want to add push notifications.

Step 10: Go to the "Database" section and make sure there's a user collection with the necessary attributes for push notifications (like email, username, etc.).

Step 11: Navigate to "Settings" and select "API".

Step 12: Click on "External Collections" and create a new collection called "OneSignal".

Step 13: Add a new Resource and fill in the details using the OneSignal API URL: https://onesignal.com/api/v1/notifications.

Step 14: Set the authentication type to "None" and fill in the relevant details for "Headers":

Authorization: Basic <REST_API_KEY>
Content-Type: application/json

Step 15: Add actions for your notifications based on your Adalo app layout.

Step 16: Go to the screen where the notification action will be triggered, and add a new action to any button or event.

Step 17: Select the "Create" action and choose the "OneSignal" collection.

Step 18: Map the fields according to the OneSignal API documentation. Some common fields include:

• app_id: App ID from OneSignal
• included_segments: Segments of users to send notifications to (e.g., All, Subscribed Users)
• contents: The message content

Example JSON body structure to map:

{
  "app_id": "<Your OneSignal App ID>",
  "included_segments": ["All"],
  "contents": {"en": "Your notification message"}
}

Step 19: Test the push notification by triggering the created action within the Adalo app.

Step 20: Check the push notification delivery in the OneSignal dashboard under "Messages".

Following these steps will integrate OneSignal push notifications into an Adalo project, allowing for custom alerts to be sent to users directly from the app.