'com.ning.billing:killbill:0.6.13'
<dependency>
<groupId>com.ning.billing</groupId>
<artifactId>killbill</artifactId>
<version>0.6.13</version>
</dependency>
<dependency org="com.ning.billing" name="killbill" rev="0.6.13"/>
"com.ning.billing", "killbill", "0.6.13"