One more, looks like the HTTP_PATCH is only used on the iOS variants.

Others, like Android, are updated using HTTP_PUT:
https://github.com/aerogear/aerogear-unifiedpush-server/blob/master/jaxrs/src/main/java/org/jboss/aerogear/unifiedpush/rest/registry/applications/AndroidVariantEndpoint.java#L92-L97