When collecting card details from users for payment, use smart defaults and foresee potential errors that users might make. Ensure the debit/credit card number layout follows the input mask format. It automatically formats spaces in the card number field, making it easier for users to check what they are typing.

Once users select their country, make the system fetch the corresponding currency — it saves time and effort and helps prevent mistakes. By not confusing users with prices, you foster trust and create a positive impression about your brand.

Another best practice that can be applied to filling in the card number input is to allow the system to detect the card type automatically. It can be implemented by checking the first four digits so users don’t have to select it manually.