The author of ‘league/oauth2-server’, Alex Bilbie, no longer has time to maintain the package and as such is seeking a new maintainer.
What is league/oauth2-server?
Put frankly, it’s an open-source package used by millions worldwide. There are examples of huge packages built on top of it – such as Laravel passport – so if you’re of the more oblivious nature, it’s possible you’re using it without even knowing.
The package offers a standards compliant PHP implementation of an OAuth 2,0 server. It supports the following grant-types natively (but is extensible in that more can be added):