Customising push messages

The Notification Plugin by default handles a specific format of push notification message data sent by the NDS:

{
    "notification_type": "swap_updated",
    "notification_payload": "{ \"id\": \"\", \"status\": \"\" }",
    "app_data": ""
}

To customize the push notification message data handled by the Notification Plugin, follow the code examples below for iOS and Android. In these examples, the notification_type and notification_payload fields are replaced with custom_type and custom_payload.

Swift
First you need to override the getTaskFromNotification function in the implementation of the SDKNotificationService class. Then from content.userInfo use the custom fields to get the notification type and payload: 
class NotificationService: SDKNotificationService {
    // Override the `getTaskFromNotification` function 
    override func getTaskFromNotification() -> TaskProtocol? {
        guard let content = bestAttemptContent else { return nil }
        guard let notificationType = content.userInfo["custom_type"] as? String else { return nil }
        self.logger.log(tag: TAG, line: "Notification payload: \(content.userInfo)", level: "INFO")
        self.logger.log(tag: TAG, line: "Notification type: \(notificationType)", level: "INFO")
        
        guard let payload = content.userInfo["custom_payload"] as? String else {
            contentHandler!(content)
            return nil
        }
        
        self.logger.log(tag: TAG, line: "\(notificationType) data string: \(payload)", level: "INFO")
        switch(notificationType) {
        case Constants.MESSAGE_TYPE_SWAP_UPDATED:
            return SwapUpdatedTask(payload: payload, logger: self.logger, contentHandler: contentHandler, bestAttemptContent: bestAttemptContent)
        case Constants.MESSAGE_TYPE_LNURL_PAY_INFO:
            return LnurlPayInfoTask(payload: payload, logger: self.logger, contentHandler: contentHandler, bestAttemptContent: bestAttemptContent)
        case Constants.MESSAGE_TYPE_LNURL_PAY_INVOICE:
            return LnurlPayInvoiceTask(payload: payload, logger: self.logger, contentHandler: contentHandler, bestAttemptContent: bestAttemptContent)
        default:
            return nil
        }
    }
}
Kotlin
First you need to change the RemoteMessage.asMessage function in the implementation of the MessagingService class. Then from data use the custom fields to get the notification type and payload: 
class ExampleFcmService : MessagingService, FirebaseMessagingService() {
    // Change the `RemoteMessage.asMessage` function
    private fun RemoteMessage.asMessage(): Message? {
        return data["custom_type"]?.let {
            Message(data["custom_type"], data["custom_payload"])
        }
    }
}