ProxyLimbo

Maven:

<repository>
    <id>jitpack.io</id>
    <url>https://jitpack.io</url>
</repository>

<dependency>
    <groupId>com.github.U61vashka</groupId>
    <artifactId>ProxyLimbo</artifactId>
    <version>1.0.2</version>
</dependency>

Gradle:

repositories {
    maven { url 'https://jitpack.io' }
}

dependencies {
    implementation 'com.github.U61vashka:ProxyLimbo:1.0.2'
}

plugin.yml/bungee.yml

name: YourPluginHere
main: class.to.main
version: 1.0.0 # Your version here
depends: [ProxyLimbo] # or softDepends

ProxyPlugin plugin = ProxyPlugin.instance(); // Our api plugin

ProxyLimbo plugin = ProxyLimbo.instance()
String limboName = "test";
ProxiedPlayer player = //Our player;
LimboServer server = plugin.getLimboServerContainer().findFirst(server -> server.getName().equals(limboName)).orElse(null);

// From object
ProxiedPlayer player = //Our player
LimboPlayer limboPlayer = plugin.fetchLimboPlayer(player);
// From UUID
LimboPlayer limboPlayer = plugin.findLimboPlayer(uniqueId);

LimboServer server = //limbo server;
LimboPlayer player = //limbo server
server.connect(player);