PayPalAccessOpenIDConnect.PHP

auth.php

/**
    * Get Access Token
    *
    * After the user is forwarded back to the application callback (defined in
    * the application at devportal.x.com) and the code parameter is available on
    * the query string, exchange the code parameter for an access token.
    * 
    */
    public function get_access_token(){
        $code = $_GET['code'];
        
        $postvals = sprintf("client_id=%s&client_secret=%s&grant_type=authorization_code&code=%s",
                            $this->key,
                            $this->secret,
                            $code,
                            urlencode($this->callback_url));
        
        $token = json_decode($this->run_curl(ACCESS_TOKEN_ENDPOINT, "POST", $postvals));
        
        $this->access_token = $token->access_token;
        $this->refresh_token = $token->refresh_token;
        $this->id_token = $token->id_token;
        
        return $token;
    }