src/Pay.php
public function driver($driver)
    {
        if (is_null($this->config->get($driver))) {
            throw new InvalidArgumentException("Driver [$driver]'s Config is not defined.");
        }
        $this->drivers = $driver;
        return $this;
    }
public function driver($driver)
    {
        if (is_null($this->config->get($driver))) {
            throw new InvalidArgumentException("Driver [$driver]'s Config is not defined.");
        }
        $this->drivers = $driver;
        return $this;
    }
指定驱动器
@param string $driver
@return $this