This is Braintree's v.zero SDK for Android. Integrate this library to accept payments in your Android app.
'com.braintreepayments.api:braintree:2.1.2'
<dependency>
<groupId>com.braintreepayments.api</groupId>
<artifactId>braintree</artifactId>
<version>2.1.2</version>
</dependency>
<dependency org="com.braintreepayments.api" name="braintree" rev="2.1.2"/>
"com.braintreepayments.api", "braintree", "2.1.2"