ChatBot PHP - Facebook Messenger

Hello, how are you? I am creating a chatbot but I am having problems with HTTP (POST) request.

When I call a function to send the POST to Facebook Messenger it seems to loop and start sending all the posts. Generating this as a result:

Lookatthemaincode(index.php)thatcallsthefunction:

include'Banco.php';include'Envio.php';$banco=newBanco();$envio=newEnvio();switch($banco->getSecao($sender_id)){case0://APRESENTACAOEPEDECPF$envio->apresentacao($sender_id);break;case1://BOASVINDASEPEDECPF$banco->setSecao($sender_id,2);$envio->boasvindas($sender_id);break;case2://EXIBERASTREIO$banco->setSecao($sender_id,3);$envio->pedidos($sender_id);break;case3://PEDECODIGODERASTREIO$banco->setSecao($sender_id,4);$envio->tracking($sender_id);break;case4://AGRADECEOUSOPEDECPFECOLOCAASECAOEM2$banco->setSecao($sender_id,2);$envio->agradecimento($sender_id);break;}

BotshouldsendthePOSTonlyfromthe"section" that is returned from the registry. But he goes into all of them. I've tried leaving just one case. he keeps sending this case several times. Here is an example of class Shipping:

private function send($dados){            
        $url = $this->apiUrl . '?access_token=' . $this->access_token;
        $ch = curl_init();
        curl_setopt($ch, CURLOPT_URL, $url);
        curl_setopt($ch, CURLOPT_POST, 1);
        $params = http_build_query($dados);
        curl_setopt($ch, CURLOPT_POSTFIELDS, $params); 
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, false);
        $server_output = curl_exec ($ch);
        curl_close ($ch);
        return $server_output;
    }

    public function apresentacao($idClient){
        $responseJSON = array(
            "recipient" => array(
                "id" => $idClient
            ),
            "message" => array(
                "text" => "Olá, eu sou o Onex, tudo bem?\nQue legal te ver por aqui! Posso te ajudar a rastrear algum pedido?"
            )
        );
        $response = $this->send($responseJSON);

        $responseJSON = array(
            "recipient" => array(
                "id" => $idClient
            ),
            "message" => array(
                "text" => "Pra começar, vou precisar de seu CPF ou CNPJ:"
            )
        );
        $response = $this->send($responseJSON);
    }