Error implementing PayPal payment in PHP website

I’m struggling trying to ollow PayPal paiyment on my PHP website. I built wrote the following method to hadle order creation, but I keep getting an error when trying to parse PayPal response to JSON.

        function createOrder($amount, $info) {
            $pp_env = PAYPAL_ENVIRONMENT_MODE == 1 ? PAYPAL_SANDBOX_ENV : PAYPAL_LIVE_ENV ;
            $accessToken = $this->generateAccessToken();
            $url = $pp_env."/v2/checkout/orders";
            $data = array(
                'intent' => 'CAPTURE',
                'purchase_units' => array(
                    array(
                        'amount' => array(
                            'currency_code' => CURRENCY_CODE,
                            'value' => $amount,
                        ),
                    ),
                ),
            );
            $headers = array(
                "Content-type: application/json",
                "Accept: application/json",
                "Authorization: Bearer " . $accessToken,
            );
            $ch = curl_init();
            curl_setopt($ch, CURLOPT_URL, $url);
            curl_setopt($ch, CURLOPT_POST, 1);
            curl_setopt($ch, CURLOPT_POSTFIELDS, json_encode($data));
            curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);
            curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
            $response = curl_exec($ch);
            curl_close($ch);
            return json_decode($response, true);
        }

My error is client-side when I try to convert HTTP response to JSON using this code:

        createOrder() {
          return fetch("<?=base_url("public/paypal_create")?>", {
            method: "POST",
            headers: {
              "Content-Type": "application/json"
            }
          })
          .then((response) => response.json())
          .then((order) => order.id);
        }

enter image description here

Following is the response I can see using browser dev tools:
enter image description here

Anyone can figure out whqt I’m doing wrong?