Desktop: To see the packages you've bought before, go to Profile Settings. Look for the portrait icon next to the "Credits" tab and click it. A menu will appear—find "My Payments" there to view your payment history.
Mobile: To check your past purchases, go to the "Credits" section. Tap the portrait icon at the top right of your screen, then tap "Credits" in the menu. From there, select "Billing History". Pick your dates and tap "Show billing history" to see your payment details.
All successful purchases should appear on your bank statement. We work with different payment processors, so your statement will show a generic description, not the website's name, to protect your privacy.