public function all($country = null, $currency = null, $amount = null)
    {
        $attributes = array_filter(
            compact('country', 'currency', 'amount')
        );

        return $this->get('/gateways', $attributes);
    }
public function all($country = null, $currency = null, $amount = null)
    {
        $attributes = array_filter(
            compact('country', 'currency', 'amount')
        );

        return $this->get('/gateways', $attributes);
    }
public function all ( $ country = null , $ currency = null , $ amount = null ) { $ attributes = array_filter ( compact ( 'country' , 'currency' , 'amount' ) ) ; return $ this -> get ( '/gateways' , $ attributes ) ; }
Get all gateways.

@param string|null $country
@param string|null $currency
@param int|null    $amount
@return array
Get all gateways .