Hello @Panos Stav
Thanks for reaching out to us, are you considering leveraging Bot Builder .NET SDK? You can leverage channel adapter C# to connect your bot to WhatsApp as below reop.
Please check on above document and see if that is what you are looking for.
Also, please check on the document if you need more information about the channel information -
I hope this helps.
Regards,
Yutong
-Please kindly accept the answer and vote 'Yes' to support the community if you feel helpful, thanks a lot.