Click on your profile picture (or initials) on the top right and select any option under billing in the drop-down as required:
Balance and purchases: Add balance to your account and configure/edit automatic payments.
Transaction history: Check all transactions in your account for a selected period (up to 3 months).
Monthly usage summary: Check the monthly usage of the balance on your account including number purchases & renewals, SMS and WhatsApp spends aggregated by country and message types (where applicable).
Payment receipts: Check all payments made on your account including automatic payments.