Customers are trying to pay, but too many purchases are failing. Learn what recent Visa and Adyen findings reveal about online payment declines, how card changes and fraud controls affect approvals, and what business owners should investigate before losing more sales.

More customers are reaching your checkout, but fewer payments are being approved. This 2026 guide explains why online transactions may be declined, including issuer fraud controls, consumer credit pressure, Capital One card changes, MCC restrictions, stored credentials and Mastercard SMMP—and what business owners should review when transaction attempts rise but revenue falls.