crm.activity.update

curl -X POST \
-H "Content-Type: application/json" \
-H "Accept: application/json" \
-d '{"id":999,"fields":{"RESPONSIBLE_ID":1,"DESCRIPTION":"Новое описание дела"},"auth":"**put_access_token_here**"}' \
https://**put_your_bitrix24_address**/rest/crm.activity.update

// 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: 'crm.activity.update',
    params: {
      id: 999,
      fields: {
        RESPONSIBLE_ID: 1,
        DESCRIPTION: 'New activity description',
      },
    },
    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('Activity updated successfully:', 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 updateActivity() {
    try {
      // Initialize the SDK inside a Bitrix24 frame
      const $b24 = await B24Js.initializeB24Frame()

      const response = await $b24.actions.v2.call.make({
        method: 'crm.activity.update',
        params: {
          id: 999,
          fields: {
            RESPONSIBLE_ID: 1,
            DESCRIPTION: 'New activity description',
          },
        },
        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('Activity updated successfully:', result)
    } catch (error) {
      // Thrown on transport or SDK failures (AjaxError, SdkError, etc.)
      console.error(error)
    }
  }

  document.addEventListener('DOMContentLoaded', updateActivity)
</script>

from datetime import datetime, timedelta
from b24pysdk.errors import BitrixAPIError, BitrixSDKException

try:
    bitrix_response = client.crm.activity.update(
        bitrix_id=999,
        fields={
            "SUBJECT": "Updated follow-up",
            "DEADLINE": (datetime.now() + timedelta(days=1)).isoformat(timespec="seconds"),
            "DESCRIPTION": "Updated activity description",
            "RESPONSIBLE_ID": 1,
            "COMPLETED": "N",
        },
    ).response
    result = bitrix_response.result
    print(result)
except BitrixAPIError as error:
    print(
        "Ошибка Bitrix API",
        f"error: {error.error}",
        f"error_description: {error.error_description}",
        sep="\n",
    )
except BitrixSDKException as error:
    print(f"Ошибка Bitrix SDK: {error.message}")
except Exception as error:
    print(f"Непредвиденная ошибка: {error}")

try {
    $response = $b24Service
        ->core
        ->call(
            'crm.activity.update',
            [
                'id' => 999,
                'fields' => [
                    "RESPONSIBLE_ID" => 1,
                    "DESCRIPTION" => "Новое описание дела"
                ]
            ]
        );

    $result = $response
        ->getResponseData()
        ->getResult();

    echo 'Success: ' . print_r($result, true);
    // Нужная вам логика обработки данных
    processData($result);

} catch (Throwable $e) {
    error_log($e->getMessage());
    echo 'Error updating activity: ' . $e->getMessage();
}

BX24.callMethod(
    'crm.activity.update',
    {
        id: 999,
        fields: {
            "RESPONSIBLE_ID": 1, 
            "DESCRIPTION": "Новое описание дела"
        }
    },
    result => {
        if (result.error()) {
            console.error(result.error());
        } else {
            console.dir(result.data());
        }
    }
);

require_once('crest.php');

$result = CRest::call(
    'crm.activity.update',
    [
        'id' => 999,
        'fields' => [
            'RESPONSIBLE_ID' => 1,
            'DESCRIPTION' => 'Новое описание дела'
        ]
    ]
);

echo '<PRE>';
print_r($result);
echo '</PRE>';

// client и ctx уже созданы — см. раздел «SDK для Go»
res, err := client.Core().Call(ctx, "crm.activity.update", b24.Params{
	"id": 999,
	"fields": b24.Params{
		"RESPONSIBLE_ID": 1,
		"DESCRIPTION":    "Новое описание дела",
	},
})
if err != nil {
	return fmt.Errorf("crm.activity.update: %w", err)
}

var ok bool
if err := json.Unmarshal(res.Result, &ok); err != nil {
	return fmt.Errorf("разбор ответа: %w", err)
}
fmt.Println("выполнено:", ok)