PayPal\Auth\Oauth\AuthSignature::genSign PHP Method

    public function genSign($key, $secret, $token, $tokenSecret, $httpMethod, $endpoint)
    {
        $authServer = new OAuthServer(new MockOAuthDataStore());
        $hmac_method = new OAuthSignatureMethodHmacSha1();
        $authServer->add_signature_method($hmac_method);
        $sig_method = $hmac_method;
        $authConsumer = new OAuthConsumer($key, $secret, null);
        $authToken = null;
        $authToken = new OAuthToken($token, $tokenSecret);
        //$params is the query param array which is required only in the httpMethod is "GET"
        $params = array();
        //TODO: set the Query parameters to $params if httpMethod is "GET"
        $acc_req = OAuthRequest::from_consumer_and_token($authConsumer, $authToken, $httpMethod, $endpoint, $params);
        $acc_req->sign_request($sig_method, $authConsumer, $authToken);
        return OAuthutil::parseQueryString($acc_req);
    }