The difference between these two debit choices is whether a PIN (personal identification number) is used at the point of sale. When a PIN is used the transaction becomes “online” and funds are immediately withdrawn from the cardholder’s available funds. When an offline debit transaction occurs, funds are not withdrawn until the transaction processes – usually 2-4 days after the sale. Debit card transactions are the fastest growing point-of-sale payment method today. The acceptance of this payment method continues to remain popular because customers and merchants both appreciate the convenience and ease of using debit cards to purchase merchandise and services.