I see that sending OTP via SMS has been too expensive nowadays especially for global SMSs. Therefore, I want to use Whataspp so send OTPs for login and other stuffs instead of SMS. Therefore, I would like to be able to send message via PHP programmatically. I see whatsapp has a documentation here for it's business API https://developers.facebook.com/docs/whatsapp. However, I cannot see any example or sample code for any programming language, let alone PHP. Therefore, I wanted to know if there are any sample codes available that you could suggest me to have a look at or a working code that may you have written for your own sake in PHP.
source https://stackoverflow.com/questions/69366333/sending-whatsapp-message-via-php-programmatically-for-otp
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