Kill Bill payment plugin apis

'com.ning.billing.plugin:killbill-plugin-api-payment:0.6.1'

<dependency>
	<groupId>com.ning.billing.plugin</groupId>
	<artifactId>killbill-plugin-api-payment</artifactId>
	<version>0.6.1</version>
</dependency>

<dependency org="com.ning.billing.plugin" name="killbill-plugin-api-payment" rev="0.6.1"/>

"com.ning.billing.plugin", "killbill-plugin-api-payment", "0.6.1"