.settings.php

См. документацию.

<?php
return [
    'controllers' => [
        'value' => [
            'defaultNamespace' => '\\Bitrix\\Rest\\Controller',
            'restIntegration' => [
                'enabled' => true,
                'hideModuleScope' => true,
                'scopes' => [
                    'appform',
                    'configuration.import',
                    'user',
                ],
            ],
        ],
        'readonly' => true
    ],
    'services' => [
        'value' => [
            'rest.service.apauth.password' => [
                'className' => \Bitrix\Rest\Service\APAuth\PasswordService::class,
            ],
            'rest.service.apauth.permission' => [
                'className' => \Bitrix\Rest\Service\APAuth\PermissionService::class,
            ],
            'rest.service.app' => [
                'constructor' => function () {
                    return new \Bitrix\Rest\Service\AppService(
                        new \Bitrix\Rest\Repository\AppRepository(
                            new Bitrix\Rest\Model\Mapper\App()
                        )
                    );
                },
            ],
            'rest.service.integration' => [
                'constructor' => function () {
                    return new \Bitrix\Rest\Service\IntegrationService(
                        new \Bitrix\Rest\Repository\IntegrationRepository(
                            new Bitrix\Rest\Model\Mapper\Integration()
                        )
                    );
                },
            ],
            'rest.repository.app' => [
                'constructor' => static function () {
                    return new \Bitrix\Rest\Repository\AppRepository(
                        new \Bitrix\Rest\Model\Mapper\App()
                    );
                },
            ],
            'rest.repository.integration' => [
                'constructor' => static function () {
                    return new \Bitrix\Rest\Repository\IntegrationRepository(
                        new \Bitrix\Rest\Model\Mapper\Integration()
                    );
                },
            ],
        ],
        'readonly' => true,
    ]
];