Mass update all Gitlab repositories inside group to have same integration (eg, Slack)

gitlab.js

const Axios = require("axios");

const ACCESS_TOKEN = "YOUR_ACCESS_TOKEN";
const GROUP_ID = "GITLAB_GROUP_ID";
const WEBHOOK_URL = "YOUR_WEBHOOK_URL";

const gitlabInstance = Axios.create({
    baseURL: "https://gitlab.com/api/v4",
    headers: {
        Authorization: `Bearer ${ACCESS_TOKEN}`
    }
});

const fetchSubgroups = groupId => {
    console.log(`Fetching subgroups for group #${groupId}`);
    return gitlabInstance.get(`/groups/${groupId}/subgroups`);
};

const fetchProjects = groupId => {
    console.log(`Fetching projects for group #${groupId}`);
    return gitlabInstance.get(`/groups/${groupId}/projects`);
};

const updateSlackService = (service, projectId) => {
    console.log(`Updating ${service} service for project #${projectId}`);
    return gitlabInstance.put(`/projects/${projectId}/services/${service}`, {
        webhook: WEBHOOK_URL,
        username: "",
        channel: "",
        notify_only_broken_pipelines: false,
        branches_to_be_notified: "all",
        commit_events: true,
        push_channel: "",
        push_events: true,
        job_events: true,
        issue_channel: "",
        issues_events: true,
        confidential_issue_channel: "",
        confidential_issues_events: true,
        merge_request_channel: "",
        merge_request_events: true,
        note_channel: "",
        note_events: true,
        confidential_note_channel: "",
        confidential_note_events: true,
        tag_push_channel: "",
        tag_push_events: true,
        pipeline_channel: "",
        pipeline_events: true,
        wiki_page_channel: "",
        wiki_page_events: true,
        deployment_channel: "",
        deployment_events: true
    });
};

fetchSubgroups(GROUP_ID).then(subgroups => {
    subgroups.data.forEach(subgroup => {
        fetchProjects(subgroup.id).then(projects => {
            projects.data.forEach(project => {
                updateSlackService("slack", project.id);
            });
        });
    });
});