Hi there, Your app has to be available either on Google Play or Apple App Store (at least one of these two, or both). If it's also available in other stores, that's fine:
https://developer.amazon.com/public/solutions/underground/docs/amazon-underground-eligibility-and-submission-checklists - Your mobile app must be available for download from the Google Play store or Apple App Store, and be monetized in at least one of the following ways: - The app is available for purchase for a fee in all other app stores where it is sold. - The app contains in-app items that are available for purchase for a fee. - Your mobile app must not contain any subscription in-app items. - The features and gameplay of the Amazon Underground version of your app must be substantially similar to or better than the non-Underground version. - When you submit your app to the Amazon Appstore, you must make your app available for distribution on at least one non-Amazon mobile device.
Thanks Lenov. Just for clarity. If my app is available for sale at the Opera App store but not Google play or Apple app store then my app is not eligible for Amazon Underground. Correct? Message was edited by: Amazon Customer