Receipt Hog will NOT see your credit or debit card numbers. The receipts you submit do NOT contain this information as only the last 4-digits of the card number are printed on receipts in order to protect your privacy and identity.
If you purchase any specific items that you don't want to make visible to Receipt Hog, simply mark over them before taking pictures of the receipt so that they cannot be read. You may also simply not submit a receipt at any time for any reason.
Please note, overly marking up a receipt may cause the receipt to be declared invalid as a manipulated receipt.