All businesses are required to begin customer conversations using an approved template message, with the template's category defining both the conversation type and applicable charges. Pricing is calculated dynamically, factoring in the message category along with the recipient's country or region. The WhatsApp Business API operates on a 24-hour session billing system, where a single flat fee covers all messages exchanged within each conversation window. ​​Try EC's WhatsApp Pricing Calculator now to instantly estimate your messaging expenses.​