I've tried searching their forums and going through their documentation. But I didn't find any information on how to integrate php-list with an existing web-app.
It's a complete new software in itself, with new users and everything. I need to create users, add/remove them from lists using some form of REST or other integration.
As far as I've searched, there's a means to add someone to a list, using a single http-request. But I didn't find means to remove someone from such a list.
I also found out there are plugins etc. for various CMSes for integration.
But I have a java-webapp and looking for something easy to implement, otherwise the only way I see is to use htmlunit (or similar tool) to send requests for everything.
No it does not have API for integration with other apps. I had to develop a custom phplist integration API for my employer.