This is integrate with Google Wallet api.
- Codelabs: https://codelabs.developers.google.com/add-to-wallet-android.
- Setup: https://developers.google.com/wallet/generic/web/prerequisites#1.-sign-up-for-a-google-wallet-api-issuer-account.
- Smart tap: https://developers.google.com/wallet/smart-tap/introduction/overview.
- HCE: https://developer.android.com/guide/topics/connectivity/nfc/hce.html.