The items in your game (lives, coins and boosters) are stored locally on your device (computers, tablets and mobile phones). You're not able to transfer your items across devices, as this caused crashing issues. We hope to be able to change this in the future!
If you want to ensure you receive your lives, coins or boosters on a specific device, make sure you use that device when you first collect or purchase them. For example, if you'd like to accept lives from a friend and want them to show up on your mobile device, you'll need to accept these lives on your mobile device. This encompasses coins and boosters as well. If you purchase them on your mobile device, they'll only be available on your mobile device.