I am working on implementing a custom WhatsApp API integration to send verification codes to users on WhatsApp. I have already been approved for access to the WhatsApp Business API and obtained the necessary credentials.

Now, I want to send verification codes to users through WhatsApp using my custom integration. But I don't have any idea that how to do that?

I just wanna know How do I generate a random verification code in my application without getting any bugs?

And also I wanna know Which WhatsApp API endpoints should I use to send the verification code as a text message?

I was expecting a the most suitable way to do these things without getting any bugs