Service/PairStorage.php
public function get($key)
    {
        $pair = $this->repository->find($key);

        return $pair ? $pair->getValue() : null;
    }
public function get($key)
    {
        $pair = $this->repository->find($key);

        return $pair ? $pair->getValue() : null;
    }
Returns pair value by key.

@param string $key

@return mixed