/pvplevels help
/pvplevels stats (player)
/pvplevels top kills/deaths/level/xp/killstreak/killstreak_top
/pvplevels reload
/pvplevels save
/pvplevels multiplier <player> <multiplier value> <time>
/pvplevels xp <player> (+/-)<amount>
/pvplevels level <player> (+/-)<amount>
/pvplevels reset deaths/kills/killstreak/level/stats <player> <true/false>
/pvplevels group set/reset <player> <group>
/pvplevels message <player> <message>
/pvplevels actionbar <player> <time> <text>
/pvplevels broadcast null/<permission> <message>
/pvplevels generate <group> <amount>

Permissions:
pvplevels
"Note: Without this node, there will be no access to any command."

pvplevels.*
pvplevels.player.*
pvplevels.admin.*
pvplevels.player.help
pvplevels.player.stats
pvplevels.player.top
pvplevels.admin.reload
pvplevels.admin.save
pvplevels.admin.multiplier
pvplevels.admin.xp
pvplevels.admin.level
pvplevels.admin.reset
pvplevels.admin.group
pvplevels.admin.message
pvplevels.admin.actionbar
pvplevels.admin.broadcast
pvplevels.admin.generate

{player}
{target}
{uuid}
{level_group}
{level_prefix}
{level_suffix}
{kills}
{deaths}
{xp}
{level}
{level_next}
{kdr}
{kill_factor}
{killstreak}
{killstreak_top}
{xp_required}
{xp_need}
{xp_progress}
{xp_progress_style}
{xp_progress_style_2}
{time}
{group}
{xp_type}
{xp_get}
{xp_lost}
{xp_item}
{xp_multiplier}
{xp_multiplier_time}
{xp_multiplier_time_left}
{source}

PlaceholderAPI:
%pvplevels_kills%
%pvplevels_deaths%
%pvplevels_xp%
%pvplevels_level%
%pvplevels_level_next%
%pvplevels_killstreak%
%pvplevels_killstreak_top%
%pvplevels_kdr%
%pvplevels_kill_factor%
%pvplevels_xp_need%
%pvplevels_xp_required%
%pvplevels_xp_required_next%
%pvplevels_xp_progress%
%pvplevels_xp_progress_style%
%pvplevels_xp_progress_style_2%
%pvplevels_time%
%pvplevels_group%
%pvplevels_level_group%
%pvplevels_level_prefix%
%pvplevels_level_suffix%
%pvplevels_xp_type%
%pvplevels_xp_get%
%pvplevels_xp_lost%
%pvplevels_xp_item%
%pvplevels_multiplier%
%pvplevels_multiplier_time%
%pvplevels_multiplier_time_left%

%pvplevels_top_<number>_kills_name%
%pvplevels_top_<number>_kills%
%pvplevels_top_<number>_deaths_name%
%pvplevels_top_<number>_deaths%
%pvplevels_top_<number>_xp_name%
%pvplevels_top_<number>_xp%
%pvplevels_top_<number>_level_name%
%pvplevels_top_<number>_level%
%pvplevels_top_<number>_killstreak_name%
%pvplevels_top_<number>_killstreak%
%pvplevels_top_<number>_killstreak_top_name%
%pvplevels_top_<number>_killstreak_top%

%pvplevels_helmet_remaining_durability%
%pvplevels_helmet_max_durability%
%pvplevels_chestplate_remaining_durability%
%pvplevels_chestplate_max_durability%
%pvplevels_leggings_remaining_durability%
%pvplevels_leggings_max_durability%
%pvplevels_boots_remaining_durability%
%pvplevels_boots_max_durability%
%pvplevels_item_in_mainhand_remaining_durability%
%pvplevels_item_in_mainhand_max_durability%
%pvplevels_item_in_offhand_remaining_durability%
%pvplevels_item_in_offhand_max_durability%