public function postRequest($url, $fields = [], $ref = null, $opts = []) {
        return $this->_curl($url, $fields, $ref, $opts);
    }
public function postRequest($url, $fields = [], $ref = null, $opts = []) {
        return $this->_curl($url, $fields, $ref, $opts);
    }
public function postRequest ( $ url , $ fields = [ ] , $ ref = null , $ opts = [ ] ) { return $ this -> _curl ( $ url , $ fields , $ ref , $ opts ) ; }
Create a post request
@param string $url
@param array $fields
@param null $ref
@param array $opts
@return string
Create a post request