Login plugin for [SpongeAPI 3.0->3.1]

Plugins Plugin Requests
1

every plug-in updated on SpongeAPI 3.0 or SpongeAPI 3.1 ,but the log-in plug-in has not been implement yet now
now FlexibleLogin will still not in the SpongeAPI 3.0 and it couldn’t work well with other newer plug-in,
anyone has some solution ?