Android Pay officially launched on Thursday, though it may be a few days before you can actually use it. Google says it’s rolling out the new mobile payments service this week through an update in the Google Play Store.

If you’re using the original Google Wallet up you should see it transform into an Android Pay app soon. Otherwise you’ll need to wait for the new app to pop-up in Google Play. It should also come pre-installed on any new Android phones from AT&T, T-Mobile and Verizon as long as they pack an NFC chip and run Android 4.4 or up.

Android Pay is set to work at over a million stores across the country. You’ll be able to pay with your smartphone at any store with NFC reader-equipped terminals, which includes GameStop, Jamba Juice, Macy’s, Subway, Staples and others. Later this year you’ll also be able to use Android Pay to make payments inside other apps, and Google plans to add loyalty card support as well.

You can check for the update right now via the Google Play link below, though like we said it may not actually be available for a few more days.