if($this->getConfig()->get("enable-double-tap")){
if(!isset($this->tap[$player->getName()]) or $now - $this->tap[$player->getName()][1] >= 1.5 or $this->tap[$player->getName()][0] !== $loc){
$this->tap[$player->getName()] = [$loc, $now];
$player->sendMessage($this->getMessage("tap-again", [$shop["itemName"], $shop["price"], $shop["amount"]]));
return;
}else{
unset($this->tap[$player->getName()]);
}
}

Uh.... In what configuration this option "enable-double-tap" ? :D