src/Client/QueryParam.php
public function setFormParameters($optionNames)
    {
        foreach ((array) $optionNames as $option) {
            $this->formParameters[$option] = true;
        }

        return $this;
    }
public function setFormParameters($optionNames)
    {
        foreach ((array) $optionNames as $option) {
            $this->formParameters[$option] = true;
        }

        return $this;
    }
Define a form parameter option.

@param $optionNames

@return $this