'com.ning.billing:killbill-api:0.2.3'
<dependency>
<groupId>com.ning.billing</groupId>
<artifactId>killbill-api</artifactId>
<version>0.2.3</version>
</dependency>
<dependency org="com.ning.billing" name="killbill-api" rev="0.2.3"/>
"com.ning.billing", "killbill-api", "0.2.3"