发送关于 whatsapp business api 用户消息的自动回复

Question

我在 Facebook Meta 中配置了一个 Business API。目前，我可以使用以下代码通过 PHP API 向用户发送消息。

$test='{
            "messaging_product": "whatsapp",
            "recipient_type": "individual",
            "to": "XX",
            "type": "template",
            "template": {
                "name": "XX",
                "language": {
                    "code": "en_US"
                },
                "components": []
            }
        }';
        
  
        

        $curl = curl_init();
        curl_setopt($curl, CURLOPT_POST, true);
        curl_setopt($curl, CURLOPT_URL, 'https://graph.facebook.com/v15.0/XXX/messages?access_token=XXX');
        curl_setopt($curl, CURLOPT_POSTFIELDS, $test );
        curl_setopt($curl, CURLOPT_HTTPHEADER, array('Content-Type: application/json') );
        curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);

        $response = json_decode(curl_exec($curl), true);
        print_r($response);
        
        $status_code = curl_getinfo($curl, CURLINFO_HTTP_CODE);
            
        curl_close($curl);

用户发消息时如何自动回复？

如何在用户发送消息时在 WhatsApp Business API 中发送自动回复。

public function webhooks(Request $request){
    
        $challenge = $request->hub_challenge;
        $verify_token = $request->hub_verify_token;
        
        if ($verify_token === 'skipper_633') {
            echo $challenge;
        }
}