Meta fees are what you pay for sending messages via WhatsApp Api , unlike WhatsApp phone APP WhatsApp API is not free of charge. It works like SMS, but better.
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Like SMS: Where you pay a fixed amount for every message you send to your customers.
But Better: WhatsApp does not charge you per message, the charge is per conversation. The conversation is defined as a window of 24 hours proceeding the first message you send. So once your campaign is sent to a customer, you can continue the conversation for free for 24 hours.
Infoseed has no control over the conversation rates, they are defined by WhatsApp per country and per type of message. View Whatsapp rates.