When you sign in, the Transactions page will display a complete record of your deposits, withdrawals, wins, one-time entries and subscriptions, to help your monitor your own activity.
You can also check for your previous purchases from the 'my account' settings, at the 'purchases' tab.
If on a desktop/pc:
Click on your account name at the top right of the website (next to the cart and where the current balance is), choose 'my account', then on the left click 'purchases'. Select the date and click 'show', the previous purchases will be displayed. Alternatively, you can just follow this link: https://lotto.jackpot.com/account-purchases