src/Iadvize/ApiRestClient/Request.php
public function addFilter($filter, $value)
    {
        if (!in_array($filter, $this->filters)) {
            $this->filters[$filter] = $value;
        }
    }
public function addFilter($filter, $value)
    {
        if (!in_array($filter, $this->filters)) {
            $this->filters[$filter] = $value;
        }
    }
Add filter

@param string $filter
@param mixed $value