WhatsApp for Business
Whatsapp for Business is a killer way to scale your CX efforts, at low cost and with automation/smart-responses built-in!
Whatsapp (for Business) can "learn" your most used responses to customers and dramatically increase the perception of your brand response time. You can also segment your users based on their "customer-state" (Order Lost, Order Damaged, Return, Sample).
Yes, it's free (for now) and WeChat (for CN markets) has an equivalent in their Serviced Account offer.