Kill Bill payment plugin apis

'org.kill-bill.billing.plugin:killbill-plugin-api-payment:0.8.4'

<dependency>
	<groupId>org.kill-bill.billing.plugin</groupId>
	<artifactId>killbill-plugin-api-payment</artifactId>
	<version>0.8.4</version>
</dependency>

<dependency org="org.kill-bill.billing.plugin" name="killbill-plugin-api-payment" rev="0.8.4"/>

"org.kill-bill.billing.plugin", "killbill-plugin-api-payment", "0.8.4"