src/Vendors/Smsgatewayme/Callback.php
public function secret(string $secret = ''): self
    {
        if (empty($secret)) {
            $secret = str_random(15);
        }

        $this->secret = $secret;

        return $this;
    }
public function secret(string $secret = ''): self
    {
        if (empty($secret)) {
            $secret = str_random(15);
        }

        $this->secret = $secret;

        return $this;
    }
If not defined, secret key will generated automatically.

@param string $secret

@return self