At the start of your billing cycle each month, you'll receive an invoice in your account. If your contract is established on invoicing terms, an email with your invoice information will also be sent to the billing contact of your account. After making a payment, a receipt will be sent to the billing administrator of your account.
You can also view your invoices and receipts within your HubSpot account:
You can also pay any due invoices on the Transactions tab. Learn more about paying invoices from within HubSpot.