The 'Credit Card Number' Field Must Allow and Auto-Format Spaces (80% Don't) – Articles – Baymard Institute

Despite 5% of users abandoning checkouts due to credit card validation errors, 80% websites don't actively aid their users in typing and validating the 16-digit card number by auto-formatting it with spaces

E-Commerce Checkouts Need to Mark Both Required Fields and

How to design a credit card form for an online store?

Format the “Expiration Date” Fields Exactly the Same as the

E-Commerce Checkouts Need to Mark Both Required Fields and

5 'Credit Card Form' Implementations That Make 'L.L. Bean' Best-in

Use a Fake 'Editing' Flow When Users Try to Update Their Stored

E-Commerce Checkouts Need to Mark Both Required Fields and

Use a Fake 'Editing' Flow When Users Try to Update Their Stored

Format the “Expiration Date” Fields Exactly the Same as the

Form Design: 6 Best Practices for Better E-Commerce UI – Baymard

64 Cart & Checkout UX Articles – Baymard Institute