I have been studying the development of an automation product for WhatsApp, specifically for sales campaigns.
I have consulted the WhatsApp Documentation and found that the price per API call for marketing is $0.0625 per conversation (in Brazil).
During a conversation with a friend, he mentioned that he pays approximately $20.00 per month for a service that allows him to send up to 20,000 messages per day to his customers.
I am curious about how these companies are able to achieve such mass message sending at a low cost. Are they bypassing WhatsApp's privacy policy, or do they have some sort of partnership or specialized service in place?
Information about WhatsApp API.