Every payment that goes through gets a confirmation email with your plan, period, amount and the date it runs until. It goes to the email address on your account.
Your full history is under Payments on the billing page: date, plan, period, how you paid, amount and status.
PayPal payments are handled by our reseller, who also sends you a receipt by email.
Tip: receipts go to the email on your account, so keep it up to date in Settings.