A: Hello,

Thank you for reaching out.

We use the official WhatsApp Business API integration (Embedded Signup)
Here is a short video that might give some idea of how you integrate in 4-5 steps: https://developers.facebook.com/docs/whatsapp/embedded-signup/

Here you can find the pricing and limits that WhatsApp apply:
https://business.whatsapp.com/products/platform-pricing

Let me know if this helps or if I can answer any other question you might have. Happy to help!

All the best,
Oscar