Do I need to save the WhatsApp number before sending message to the business account?

Do I need to save the WhatsApp number before sending message to the business account?

No. It is not necessary to save the number to send messages to any WhatsApp number. You can send messages via the wa.me link (https://wa.me/{WhatsApp number with country code}, i.e. https://wa.me/85268227287).

Click here for more details.