How does WhatsApp API work?

Related questions

1. Can twilio send international SMS?
2. What is the advantage of WhatsApp over SMS?
3. Does WhatsApp use SMS?
4. What is twilio API?
5. Can WhatsApp be default SMS?
6. How much does WhatsApp API cost?
7. Can Android send texts over WiFi?
8. Does twilio support MMS?
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2. #respond
3. #facilitates
4. #hours
5. #message
6. #allows
7. #platform
8. #businesses
9. #owned
10. #fixed
11. #easier
12. #communication
13. #customers
14. #between
15. #whatsapp
16. #business
17. #monetizes
18. #facebook
19. #after