How can I get the mobile app? I can't find it in the Google app store.

Many people like having multiple cards set up with one account. Here are the steps for adding additional cards: 1. Go to https://snappys.myguestaccount.com/guest/ and log into your account with the email and password you created. 2. Once you log in, you should see a + icon. Click that, and that should guide you through adding the additional card.