Log in to the Admin Panel and access the Billing page here: https://admin.taxicaller.net/admin/billing/overview.php You will need to look for “Card payment” on the right section titled “Recent transactions” and you will find all the payments as well as the receipts of the payments (the icon at the end of each row.)
To see older transactions, click on the “Next” link at the bottom right corner of the page. In the receipts you can see the full date of the payment.