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I am looking for an application that can integrate with Whatsapp and send messages to the recipients. Here is the scenario. My client has a phone number database of about 5 lac customers. The client wants to send them a message twice a week. The message could be plain text, photos, audio/visual files. The message should go as one on one chat not as a part of a group. Also, the client does not want to click 5 lac times twice a week. Whatsapp does not expose an API and hence looking for any other solutions.
If anyone has an application (windows/mobile/web) or have any pointers on how it can be done, please reach out to me on firstname.lastname@example.org.