WhatsApp billing now carries a 20% Kustomer fee on the usage based terms page

pricing rules by country and region for message categories established by Meta and WhatsApp and published here (the "WhatsApp Rate Card") and a per message Kustomer fee equal to 20% of the applicable per message WhatsApp fee that will be applied in the aggregate to your monthly bill.
Bad Changes that may affect your rights or add new obligations. Each WhatsApp message now carries an added Kustomer fee equal to 20% of the underlying WhatsApp fee.
25 MORE REDLINES IN THIS UPDATE