"Hey! I thought you’d really love [App Name] for your phone. I couldn't buy the app directly for you, so here is some Google Play credit to cover it. Enjoy!" Option 2: Gifting a Specific E-Book
Here are two ways to draft your gift depending on what you want to send: google play buy as gift
Google does allow direct gifting for books. If that’s the "piece" you’re looking to draft, the process is more direct. How to purchase gift cards on Google Play App google play buy as gift