class Example {

    public static void main(String[] args) {
        PacketEventsAPI api = ;// create PacketEventsAPI instance
        SpigotEntityLibPlatform platform = new SpigotEntityLibPlatform(this);
        APIConfig settings = new APIConfig(PacketEvents.getAPI())
                .debugMode()
                .tickTickables()
                .trackPlatformEntities()
                .usePlatformLogger();

        EntityLib.init(platform, settings);

        // Making a random entity using packet events raw, i strongly recommend using the EntityLib#createEntity method instead
        int entityID = 1;
        WrapperPlayServerSpawnEntity packet = new WrapperPlayServerSpawnEntity(constructor args);
        EntityMeta meta = EntityMeta.createMeta(entityId, EntityType);
        // You can cast the meta to the correct type depending on the entity type
        PigMeta pigMeta = (PigMeta) meta;

        // Once you're done modifying the meta accordingly, you can convert it to a packet, and send it to whoever you want for them  to see the changes.
        WrapperPlayServerEntityMetadata metaPacket = meta.createPacket();
        User.sendPacket(metaPacket);
    }

}

import com.github.retrooper.packetevents.protocol.world.Location;

class Example {

    public static void main(String[] args) {
        PacketEventsAPI api = ;// create PacketEventsAPI instance
        SpigotEntityLibPlatform platform = new SpigotEntityLibPlatform(this);
        APIConfig settings = new APIConfig(PacketEvents.getAPI())
                .debugMode()
                .tickTickables()
                .trackPlatformEntities()
                .usePlatformLogger();

        EntityLib.init(platform, settings);

        WrapperEntity entity = EntityLib..getApi().createEntity(UUID, EntityType); // optional uuid and entity id 
        // You can keep track of the entity yourself or store its entityId or uuid and fetch it using EntityLib.getApi().getEntity(UUID or entityId)

        // Entities also have access to the EntityMeta api, the EntityMeta api can be used seperately from wrapper entities but also can be used together
        EntityMeta meta = entity.getEntityMeta();
        // Depending on the entity type, you can safely cast the meta to the correct type
        PigMeta meta1 = (PigMeta) meta; // If the entity type is EntityTypes.PIG

        // adding a viewer to the entity can be done before or after spawn, doesnt matter
        entity.addViewer(User); // UUID also applicable
        entity.removeViewer(User); // UUID also applicable

        entity.spawn(Location); // Spawns the entity at the given location
        entity.remove(); // Removes the entity from the world
        entity.rotateHead(float yaw, float pitch); // Rotates the head of the entity
        entity.teleport(Location); // Teleports the entity to the given location.
        
        // If the entityId provider for WrapperEntities is not working for you or needs changing, you can get it from EntityLib#getEntityIdProvider()
        // You can also set it to a custom provider if needed by calling EntityLib#setEntityIdProvider(EntityIdProvider)
        int randomEntityId = EntityLib.getPlatform().getEntityIdProvider().provide();
    }

}