Как создать группу и отправить в неё сообщение#

python -m pip install whatsapp-api-client-python

from whatsapp_api_client_python import API

greenAPI = API.GreenAPI(ID_INSTANCE, API_TOKEN_INSTANCE)

create_group_response = greenAPI.groups.createGroup(
    "Group Name", ["79876543210@c.us"]
)
if create_group_response.code == 200:
    send_message_response = greenAPI.sending.sendMessage(
        create_group_response.data["chatId"], "Message text"
    )

create_group_response = await greenAPI.groups.createGroupAsync(
    "Group Name", ["79876543210@c.us"]
)
if create_group_response.code == 200:
    send_message_response = await greenAPI.sending.sendMessageAsync(
        create_group_response.data["chatId"], "Message text"
    )