OneSignal Integration

Is there a way to integrate Backendless with onesignal?

Could you describe what the integration would do?

I want to create a timer to send reminders to the users using push notifications, but I want to send the push notifications using onesignal because it offers greater functionalities

Why don’t you use the onesignal API from your timer code?

I’m sorry for the rookie question but how do I do that?
Is there a limitation for External API calls?

There are no restrictions on the external API calls. Just write your code in Java or JS to use their APIs…