Paxlava Duel by Alpay Calalli (Google Play: abilovelchin). Write to support@justisoft.com — we usually answer within 2 working days.
In the game you can also send a message from Settings → Support; it includes your player ID and app version, so we can help faster.
Settings → at the very bottom: "ID …". Include it in every email about your account, purchases or deletion.
Purchases are verified by our server and added to your account right away. If coins or items did not arrive, restart the game while online; if they still don't appear, email us the order number from Google Play or the App Store receipt.
On iPhone: Shop → "Restore purchases" brings back purchases that belong to your Apple ID.
Refunds are handled by Google Play or Apple under their rules.
Settings → link your Google or Apple account, then sign in with it on the new phone. An account that is not linked cannot be recovered.
Privacy policy: https://paxlava.justisoft.com/legal/privacy
Delete your account: Settings → "Delete account", or https://paxlava.justisoft.com/legal/delete