On a credit card digits are shown in this format– XXXX XXXX XXXX XXXX
However, when I make a purchase online the credit card field is a simple text box. Because all 16 digits appear as one block it’s hard to double-check digits by looking at the credit card. I’ve never seen a site that displays digits exactly as they appear on the card. Then I discovered mcmaster.com—
On mcmaster.com moment you complete entering credit card digits extra spacing is automatically inserted. This makes it much easier to verify digits with the card.