Форум

use Bitrix\Main\Web\HttpClient;
use Bitrix\Main\Context;

$response = [];

$request = Context::getCurrent()->getRequest();

if(!empty($request) && $request->isPost() !== false) {
    $inputs = $request->getInput();
    $inputs = json_decode($inputs);
    echo json_encode([
        'result' => 'success',
        'request' => $inputs
    ]);
}

$request = $httpClient->post($url, json_encode($params), true);
$request = json_decode($request);

stdClass Object
(
    [result] => success
    [request] => 
)

BX.ready(function() {
        let userFields = <?= Json::encode($arCurrentValues['SelectField']) ?>;
        let selectOptions = BX.create('select');
        userFields.forEach(function(item) {
            BX.selectUtils.addNewOption(selectOptions, item.FIELD_NAME, item.FIELD_DESCRIPTION);
        });
        i = 0;
        BX.bind(BX('AddFieldForUpdate'), 'click', function() {
            BX.append(BX.create('tr', {
                children: [
                    BX.create('td', {
                        props: {
                            width: '40%',
                            align: 'right'
                        },
                        children: [BX.adjust(selectOptions, {
                                attrs: {
                                    id: 'selectedField_' + (i++)
                                }
                        })]
                    }),
                    BX.create('td', {
                        props: {
                            width: '60%'
                        },
                        children: [
                            BX.create('p', {
                                text: 'some ' + i++
                            })
                        ]
                    })
                ]
            }), BX('fields'));
        });
        
    });

$batch = [
    'get_lead' => [
        'method' => 'crm.lead.get',
        'params' => ['ID' => $leadID]
    ],
    'get_user' => [
        'method' => 'user.get',
        'params' => ["ID" => '$result[get_lead][ASSIGNED_BY_ID]']
    ],
    'create_task' => [
        'method' => 'tasks.task.add',
        'params' => [
            'fields' => [
                "TITLE" => 'Тестовая задача для лида ' . '$result[get_lead][TITLE]',
                'CREATED_BY' => 331,
                "RESPONSIBLE_ID" => '$result[get_lead][ASSIGNED_BY_ID]',
                'DEADLINE' => $deadline,
                'UF_CRM_TASK' => ['L_' . $leadID],
                "DESCRIPTION" => '$result[get_user][0][NAME]' . ' ' . '$result[get_user][0][LAST_NAME]' . ',' . PHP_EOL .
                "Это тестовая задача." . PHP_EOL .
                'Ваш лид [URL=/crm/lead/details/'.$leadID.'/]' . '$result[get_lead][TITLE]' . '[/URL]'
            ]
        ]
    ]
];

CRest::callBatch($batch);

[description] => Роман Гонюков
Это тестовая задача.
Ваш лид [URL=https://bx.bookingboard.ru/crm/lead/details/3464/]test lead for tasks