If you have signed up for the Platinum service and you have a Radio Station in your app, you qualify to have Apple CarPlay. If you're unfamiliar with Apple CarPlay, here's a video demonstration.
In order for us to add CarPlay to your app, you must get approval from Apple. They won't allow us to apply for you since you're the account owner.
Here's what you need to do:
1. Go to the Contact Us page for CarPlay (login required): https://developer.apple.com/contact/carplay/
2. Select Audio type = Audio
3. Enter the following text where it says Tell us about your product:
We have an app that has Radio Stations and Mixes and we would like to be able to offer a CarPlay app to our users. We already have a robust CarPlay solution ready. It was provided by our app developer, BV Mobile Apps, Inc. We just need approval to add the entitlement to our profile.