ic.js

const Intercom = require('intercom-client');

const myAdminId = 3385260;
const client = new Intercom.Client({ token: '...=' });

const until = new Date(2020, 3, 15);
const conversationId = 25726415330;

client.conversations.reply({
    id: conversationId,
    message_type: 'snoozed',
    snoozed_until: until.getTime(),
    admin_id: myAdminId,
})
.then(() => console.log('success'))
.catch(e => console.error(e.body))
// {
//   type: 'error.list',
//   request_id: '00062udkp728do6dr380',
//   errors: [ { code: 'server_error', message: 'Server Error' } ]
// }