|ACH: Also known as Electronic Checks. With this, the customer could use his or her checking account instead of a credit card for purchases.|
Card Verification Value (CVV): This is the three- or four-digit number on the back of the card for Visa and Mastercard or the number on the front of the card for American Express. If you supply a CVV with a transaction, it's generally assumed that customers have their card with them; thus, it's not a stolen credit card number, so there's less likelihood of fraud.
Reoccurring Billing: You can set up a transaction to be run automatically at almost any interval of time.