SOAP and XML-RPC were removed from JIRA Cloud on July 6 2015 and on-prem installs of Jira 7.

https://developer.atlassian.com/jiradev/jira-apis/jira-api-status/jira-rpc-services/jira-xml-rpc-overview/soap-and-xml-rpc-api-deprecation-notice

Is there a plan for moving this plugin to the REST API?