public final class ExamplePlugin extends JavaPlugin {
    private SkullAPI skullAPI;

    @Override
    public void onEnable() {
        this.skullAPI = LiteSkullFactory.builder()
                .cacheExpireAfterWrite(Duration.ofMinutes(45L))
                .bukkitScheduler(this)
                .build();
    }
}

// you can use this item when skull will be found (synchronous)
skullAPI.acceptSyncSkull("Rollczi", itemStack -> {
    player.getInventory().addItem(itemStack);
});

skullAPI.acceptSyncSkullData("Rollczi", skullData -> {
    String value = skullData.getValue();
    String signature = skullData.getSignature();
});

// you can use this item when skull will be found (asynchronous)
skullAPI.acceptAsyncSkull("Rollczi", itemStack -> {
    itemStack
    // some code
});
skullAPI.acceptAsyncSkullData("Rollczi", skullData -> {
    String value = skullData.getValue(); // texture value
    String signature = skullData.getSignature(); // texture signature
});

// you can get completable future with skull item
CompletableFuture<ItemStack> completableFuture = skullAPI.getSkull("Rollczi");
completableFuture.thenAcceptAsync(itemStack -> {
    itemStack
    // some code
});

// you can get completable future with skull data
CompletableFuture<SkullData> completableFuture = skullAPI.getSkullData("Rollczi");
completableFuture.thenAcceptAsync(skullData -> {
    String value = skullData.getValue(); // texture value
    String signature = skullData.getSignature(); // texture signature
});

ItemStack itemStack = skullAPI.awaitForSkull("Rollczi", 10, TimeUnit.SECONDS);
SkullData skullData = skullAPI.awaitForSkullData("Rollczi", 10, TimeUnit.SECONDS);