After Creating the Call Card BackgroundCallCard::initialized

// This snippet is an ES module: top-level await requires type="module" or a bundler.
        // $b24 is an already-initialized SDK instance (see the SDK "Get started" guide).
        import { Text } from '@bitrix24/b24jssdk'
        import type { B24Frame } from '@bitrix24/b24jssdk'
        
        declare const $b24: B24Frame
        
        try {
          const response = await $b24.actions.v2.call.make<boolean>({
            method: 'placement.bindEvent',
            params: {
              PLACEMENT: 'BackgroundCallCard::initialized',
              HANDLER: '**your_handler_url_here**',
            },
            requestId: Text.getUuidRfc4122()
          })
        
          // The payload is available only on a successful response
          if (!response.isSuccess) {
            console.error(response.getErrorMessages().join('; '))
          } else {
            const result = response.getData()!.result
            console.info('placement.bindEvent result:', result)
          }
        } catch (error) {
          // Thrown on transport or SDK failures (AjaxError, SdkError, etc.)
          console.error(error)
        }
        

<!-- Load the SDK (UMD build); it is exposed as the global B24Js -->
        <script src="https://unpkg.com/@bitrix24/b24jssdk@1/dist/umd/index.min.js"></script>
        <script>
          async function bindPlacementEvent() {
            try {
              // Initialize the SDK inside a Bitrix24 frame
              const $b24 = await B24Js.initializeB24Frame()
        
              const response = await $b24.actions.v2.call.make({
                method: 'placement.bindEvent',
                params: {
                  PLACEMENT: 'BackgroundCallCard::initialized',
                  HANDLER: '**your_handler_url_here**',
                },
                requestId: B24Js.Text.getUuidRfc4122()
              })
        
              // The payload is available only on a successful response
              if (!response.isSuccess) {
                console.error(response.getErrorMessages().join('; '))
                return
              }
        
              const result = response.getData().result
              console.info('placement.bindEvent result:', result)
            } catch (error) {
              // Thrown on transport or SDK failures (AjaxError, SdkError, etc.)
              console.error(error)
            }
          }
        
          document.addEventListener('DOMContentLoaded', bindPlacementEvent)
        </script>
        

try {
            $response = $b24Service
                ->core
                ->call(
                    'placement.bindEvent',
                    [
                        'PLACEMENT' => 'BackgroundCallCard::initialized',
                        'HANDLER' => '**your_handler_url_here**'
                    ]
                );
        
            $result = $response
                ->getResponseData()
                ->getResult();
        
            echo 'Success: ' . print_r($result, true);
            processData($result);
        
        } catch (Throwable $e) {
            error_log($e->getMessage());
            echo 'Error: ' . $e->getMessage();
        }
        

BX24.callMethod(
            'placement.bindEvent',
            {
                PLACEMENT: 'BackgroundCallCard::initialized',
                HANDLER: '**your_handler_url_here**'
            },
            function(result)
            {
                if (result.error())
                {
                    console.error(result.error(), result.error_description());
                }
                else
                {
                    console.log(result.data());
                }
            }
        );
        

require_once('crest.php');
        
        $result = CRest::call(
            'placement.bindEvent',
            [
                'PLACEMENT' => 'BackgroundCallCard::initialized',
                'HANDLER' => '**your_handler_url_here**'
            ]
        );
        
        echo '<PRE>';
        print_r($result);
        echo '</PRE>';