tp5는 워크플로 승인을 위해 DingTalk를 사용합니다.

  /**
    * 钉钉access_token获取
    * @param  
    * @return access_token
    */
    public static function getAccessToken(){
        if(empty(cache('dd_access_token'))){
            $AppKey = config('ding_app_key');
            $AppSecret = config('ding_app_secret');
            $url = "https://oapi.dingtalk.com/gettoken?appkey=".$AppKey."&appsecret=".$AppSecret;
            $re = file_get_contents($url);
            $obj=json_decode($re);
            //dump($obj);
            $access_token = $obj->access_token;
            cache('dd_access_token', $access_token,7200);
        }else{
            $access_token = cache('dd_access_token');
        }
        return $access_token;
    }

 public function index()
    {
        $access_token = ApiService::getAccessToken();
        //通过审批创建的url获得
        $data['process_code'] = 'PROC-VFYJYF2V-84X3UYTT455XP7KENI603-0EWMMGTJ-I';
        $data['originator_user_id'] = '093208556229304103';
        //部门id
        $data['dept_id'] = '105672100';
        $form_component_values=array();
        $form_component_values[]=['name'=>'单行输入框','value'=>'123']
        $form_component_values[]=['name'=>['开始时间','结束时间'],'value'=>['2019-02-19','2019-02-25']];
        $form_component_values[]=['name'=>'图片','value'=>['http://pic.58pic.com/58pic/15/68/59/71X58PICNjx_1024.jpg','http://img.juimg.com/tuku/yulantu/140218/330598-14021R23A410.jpg']];
        $data['form_component_values'] = $form_component_values;
        $data= json_encode($data);
        $timeout = 5000;
        $http_header = [
                'Content-Type: application/json;'
        ];
        $ch = curl_init();
        curl_setopt ($ch, CURLOPT_URL, $token);
        curl_setopt ($ch, CURLOPT_POST, 1);
        curl_setopt ($ch, CURLOPT_POSTFIELDS, $data);
        curl_setopt ($ch, CURLOPT_HEADER, false);
        curl_setopt ($ch, CURLOPT_HTTPHEADER,$http_header);
        curl_setopt ($ch, CURLOPT_SSL_VERIFYPEER,false);
        curl_setopt ($ch, CURLOPT_CONNECTTIMEOUT, $timeout);
        curl_setopt ($ch, CURLOPT_RETURNTRANSFER, 1);
        $result = curl_exec($ch);
        if (false === $result) {
            $result =  curl_errno($ch);
        }
        curl_close($ch);
        return $result;
    }

    /**
    * 注册回调
    * 
    * @param  
    * @return 
    */
    public static function register_call_back(){
        $token = config('ding_token');
        $aes_key = config('ding_aes_key');
        //获取access_token
        $token = self::getAccessToken();
        //注册url
        $url = "https://oapi.dingtalk.com/call_back/register_call_back?access_token=".$token;
        // call_back_tag:需要注册的内容
        // token：加解密需要用到的token，自定义
        // aes_key：数据加密密钥。用于回调数据的加密，长度固定为43个字符，从a-z, A-Z, 0-9共62个字符中选取,您可以随机生成
        // url：你本地的回调地址，必须是可以外网访问
        $data = array('call_back_tag'=>['bpms_task_change','bpms_instance_change'],'token'=> $token,'aes_key'=> $aes_key,'url'=>config('ding_callback'));
        return self::curl_post($url,$data);
    } 
类似的，你还可以进行回调地址注册的查询和内容
    /**
    * 查询回调
    * 
    * @param  
    * @return 
    */
    public static function get_call_back(){
        $token = self::getAccessToken();
        $url = "https://oapi.dingtalk.com/call_back/get_call_back?access_token=".$token;
        $re = file_get_contents($url);
        return $re;
    } 
    /**
    * 更新回调
    * 
    * @param  
    * @return 
    */
    public static function update_call_back(){
        $token = self::getAccessToken();
        $url = "https://oapi.dingtalk.com/call_back/update_call_back?access_token=".$token;
        $data = array('call_back_tag'=>['bpms_instance_change'],'token'=>'123456','aes_key'=>'lfqrojwt31jnvdb5li2arj0f1qz4g8g6eqw45swgyak','url'=>config('ding_callback'));
        return self::curl_post($url,$data);
    }

 public function callback(){
            //token和aes_key就是你注册地址的时填写的内容
            $token = config('ding_token');
            $aes_key = config('ding_aes_key');
            //suite_key在内部应用使用CorpId即可，官方文档没有明确说明
            $suite_key = config('ding_suite_key');
            $signature = $_GET["signature"];
            $timeStamp = $_GET["timestamp"];
            $nonce = $_GET["nonce"];
            $postdata = file_get_contents("php://input");
            $postList = json_decode($postdata,true);
            $encrypt = $postList['encrypt'];
            //使用官方提供的加解密
            $crypt = new DingtalkCrypt();
            $crypt->DingtalkCrypt($token, $aes_key, $suite_key);
            $msg = "";
            $errCode = $crypt->DecryptMsg($signature, $timeStamp, $nonce, $encrypt, $msg);
            if ($errCode != 0){
            }else{
                /**
                 * 创建成功后的回调推送
                 */
                $eventMsg = json_decode($msg);
                $eventType = $eventMsg->EventType;
                /**
                 * 工作流变动
                 */
                if("bpms_instance_change" === $eventType){
                    /**
                     * 编写你需要的内容
                     */ 
                }           
                $res = "success";
                $encryptMsg = "";
                $errCode = $crypt->EncryptMsg($res, $timeStamp, $nonce, $encryptMsg);
                if ($errCode == 0){
                    echo $encryptMsg;
                } 
            }
        }