Maytapi Chatbot

Please read the requirements explained below : The requirement is for sending messages from a client to 50,000 contacts Max using the Maytapi unofficial Whatsapp API
The forward Message flow
1) The client sends a MESSAGE(Text, audio,Video etc) to the 20 MAYTAPI accounts linked to 20 WhatsApps Nos. Each MAYTAPI in turn the sends the MESSAGE to the associated 2500 Contacts spread over one day. So total contacts=20 x 2000=50000 contacts get the same MESSAGE spread over a day.Each day only one message is sent to all contacts.
2) As the message is from a single client , so all 20 MAYTAPI nos should have the same client name
3) So for the 20 MAYTAPI accounts we need 20 phones with SIM and connecting over whatsapp web using the QR code.
When the reverse message flow happens :
1)When a contact replies to the client and sends a MESSAGE (text,audio,video) , the MESSAGE goes to the associated MAYTAPI and from there the message is passed on to the client after masking the contact number i.e , only message is delivered to the name of contact with date and time of message
System Admin
1) The system admin , can know from the system , the successful message delivery to the contacts, the replies sent by the contact by name
2) The client cannot see the contact list at any time(that is only available for view by the admin of the system or who runs the platform). Only super user or admin user can see the contact NO list
3)Two human agents from the admin side can talk/message anytime to the client or the contacts for any clarification etc.