Since 4.2 Moodle has provided webservices for handling xAPI states from the components. However, according to the xAPI specs, there is one missing webservices to have all xAPI state services available:

• Delete multiple documents: https://github.com/adlnet/xAPI-Spec/blob/master/xAPI-Communication.md#multiple-document-delete

The implementation should  be similar to the core_xapi_get_states implemented in MDL-77802.