# Push Notification Registration

## Goal

Register the device for remote push notifications and obtain the device token to send to your server.

## Actions Required

| Action                                                     | Purpose                                               |
| ---------------------------------------------------------- | ----------------------------------------------------- |
| NotificationServicesRequestPermission                      | Request notification permissions                      |
| NotificationServicesGetRequestPermissionError              | Read cached error after permission failure (optional) |
| NotificationServicesOnRegisterForPushNotificationsComplete | Listen for device token                               |

## Variables Needed

* deviceToken (String)
* errorCode (Int)
* errorDescription (String)
* serverUrl (String) - Your backend URL

## Implementation Steps

### 1. State: RequestPermission

**Action:** NotificationServicesRequestPermission

* **Inputs:**
  * requestAlert: true
  * requestBadge: true
  * requestSound: true
* **Events:**
  * grantedEvent → ListenForToken
  * deniedEvent → ShowError
  * failureEvent → ShowError

**Optional:** On `failureEvent`, call `NotificationServicesGetRequestPermissionError` to read `errorCode` + `errorDescription`.

### 2. State: ListenForToken

**Action:** NotificationServicesOnRegisterForPushNotificationsComplete

* **Outputs:**
  * deviceToken → deviceToken variable
  * errorCode → errorCode
  * errorDescription → errorDescription
* **Events:**
  * successEvent → SendTokenToServer
  * failureEvent → ShowError

**Note:** This is a persistent listener - it waits for the registration callback from the OS.

### 3. State: SendTokenToServer

Send deviceToken to your backend server via HTTP POST:

* Endpoint: serverUrl/register-device
* Payload: {"token": deviceToken, "platform": "iOS/Android"}

**Transition:** Go to Complete

### 4. State: Complete

* Store deviceToken locally for reference
* Display success message
* Ready to receive push notifications from server

## Server Integration Flow

```
Request Permission
    └─ Listen for Token
        └─ Success → Send to Server
            └─ Server uses token for APNs (iOS) or FCM (Android)
```

## Common Issues

* **No Token Received**: Check internet connection, verify platform push setup (APNs/FCM certificates)
* **Token Changes**: Device token can change on app reinstall; always update server with latest token
* **Simulator Limitation**: Push notifications don't work on iOS Simulator; test on real devices
* **Permission Denied**: Cannot register for push without notification permissions

## Server Requirements

**iOS (APNs):**

* Valid APNs certificate or auth key
* Server sends notifications to Apple Push Notification service

**Android (FCM):**

* Firebase Cloud Messaging project setup
* Server API key configured

## Platform Differences

**iOS:**

* Returns 64-character hex string token
* Requires APNs setup in Apple Developer

**Android:**

* Returns FCM registration token
* Requires google-services.json configuration

## Security Note

Treat device tokens as sensitive data. Always transmit via HTTPS to your server and store securely.


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