im.chat.updateAvatar

curl -X POST \
-H "Content-Type: application/json" \
-H "Accept: application/json" \
-d '{"CHAT_ID":2935,"AVATAR":"/9j/4QAYRXhpZgAAS...CgCgCgCgP/9k=","auth":"**put_access_token_here**"}' \
https://**put_your_bitrix24_address**/rest/im.chat.updateAvatar

// 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: 'im.chat.updateAvatar',
    params: {
      CHAT_ID: 2935,
      AVATAR: '/9j/4QAYRXhpZgAAS...CgCgCgCgP/9k=',
    },
    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('Avatar updated:', 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 updateChatAvatar() {
    try {
      // Initialize the SDK inside a Bitrix24 frame
      const $b24 = await B24Js.initializeB24Frame()

      const response = await $b24.actions.v2.call.make({
        method: 'im.chat.updateAvatar',
        params: {
          CHAT_ID: 2935,
          AVATAR: '/9j/4QAYRXhpZgAAS...CgCgCgCgP/9k=',
        },
        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('Avatar updated:', result)
    } catch (error) {
      // Thrown on transport or SDK failures (AjaxError, SdkError, etc.)
      console.error(error)
    }
  }

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

from b24pysdk.errors import BitrixAPIError, BitrixSDKException

try:
    bitrix_response = client.im.chat.update_avatar(
        chat_id=2935,
        avatar="/9j/4QAYRXhpZgAAS...CgCgCgCgP/9k=",
    ).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(
            'im.chat.updateAvatar',
            [
                'CHAT_ID' => 2935,
                'AVATAR' => '/9j/4QAYRXhpZgAAS...CgCgCgCgP/9k='
            ]
        );

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

    echo 'Success: ' . print_r($result, true);
    processData($result);

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

BX24.callMethod(
    'im.chat.updateAvatar',
    {
        CHAT_ID: 2935,
        AVATAR: '/9j/4QAYRXhpZgAAS...CgCgCgCgP/9k=',
    },
    function(result)
    {
        if (result.error())
        {
            console.error(result.error());
        }
        else
        {
            console.log(result.data());
        }
    }
);

require_once('crest.php');

$result = CRest::call(
    'im.chat.updateAvatar',
    [
        'CHAT_ID' => 2935,
        'AVATAR' => '/9j/4QAYRXhpZgAAS...CgCgCgCgP/9k='
    ]
);

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

// client и ctx уже созданы — см. раздел «SDK для Go»
res, err := client.Core().Call(ctx, "im.chat.updateAvatar", b24.Params{
	"CHAT_ID": 2935,
	"AVATAR":  "/9j/4QAYRXhpZgAAS...CgCgCgCgP/9k=",
})
if err != nil {
	return fmt.Errorf("im.chat.updateAvatar: %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)