"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
Since you can't buy the app itself, you send a digital gift card. Your recipient can then use that balance to download the app you have in mind. Open the Google Play Store app. Tap your profile icon at the top right. google play buy as gift
Look for or "Send gift" (availability varies by region). google play buy as gift