Trouble Sending Elementor Form Data via cURL in WordPress

Question

I'm adapting the code to retrieve information from the Elementor form. I've referred to the documentation, and I have an example code snippet.

  function send_custom_webhook( $record, $handler ) {

    $form_name = $record->get_form_settings( 'form_name' );

    // Replace MY_FORM_NAME with the name you gave your form
    if ( 'MY_FORM_NAME' !== $form_name ) {
        return;
    }

    $raw_fields = $record->get( 'fields' );
    $fields = [];
    foreach ( $raw_fields as $id => $field ) {
        $fields[ $id ] = $field['value'];
    }

    wp_remote_post(
        'https://api.example.com/',
        [
            'body' => $fields,
        ]
    );
} 
add_action( 'elementor_pro/forms/new_record', 'send_custom_webhook', 10, 2 );

And here is the code from the platform that I'm attempting "Wolkvox", I've referred to the documentation, and I have an example code snippet.

    $curl = curl_init();
    
    curl_setopt_array($curl, array(
      CURLOPT_URL => '',
      CURLOPT_RETURNTRANSFER => true,
      CURLOPT_ENCODING => '',
      CURLOPT_MAXREDIRS => 10,
      CURLOPT_TIMEOUT => 0,
      CURLOPT_FOLLOWLOCATION => true,
      CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
      CURLOPT_CUSTOMREQUEST => 'POST',
      CURLOPT_POSTFIELDS =>'[{
                "customer_name": "name",
                "customer_id": "customerID",
                "opt1": "tel1",
               
    
    }]',
      CURLOPT_HTTPHEADER => array(
        'wolkvox-token: '
      ),
    ));
    
    $response = curl_exec($curl);
    
    curl_close($curl);
    echo $response;
    
    
    }

The following is the output when I integrate both code samples

function send_to_external_api( $record, $handler ) {
   
    $form_name = $record->get_form_settings( 'Testing' );

  
    if ( 'Testing' !== $form_name ) {
        return;
    }


    $raw_fields = $record->get( 'fields' );
    $fields = [];
    foreach ( $raw_fields as $id => $field ) {
        $fields[ $id ] = $field['value'];
    }

   
    $data = json_encode([
        "customer_name" => $fields['name'], 
        "customer_id" => $fields['customerID'], 
        "tel1" => $fields['tel1'], 
    ]);

    $curl = curl_init();

    curl_setopt_array($curl, array(
        CURLOPT_URL => '',
        CURLOPT_RETURNTRANSFER => true,
        CURLOPT_ENCODING => '',
        CURLOPT_MAXREDIRS => 10,
        CURLOPT_TIMEOUT => 0,
        CURLOPT_FOLLOWLOCATION => true,
        CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
        CURLOPT_CUSTOMREQUEST => 'POST',
        CURLOPT_POSTFIELDS => $data,
        CURLOPT_HTTPHEADER => array(
            'wolkvox-token: ',
            'Content-Type: application/json', 
        ),
    ));

    $response = curl_exec($curl);

    curl_close($curl);
    echo $response; 
}

However, it's not sending any information to the API. Upon checking the Wolkvox platform, there doesn't appear to be any added information.

I have replaced the corresponding information in both the CURLOPT_URL and the token.

I would appreciate any guidance regarding what I might be doing wrong or why the information isn't being sent.