Dashlane allows you to automatically fill out checkout fields. Purchases that would normally take minutes to complete instead take only seconds.
Just click into the field and a popup will appear to confirm your account, name or card as saved in Dashlane. Choose your account and Dashlane will fill in the form instantly. Note that for your security, you're asked to enter your Master Password whenever you use your credit cards.
Note: Dashlane doesn't autofill payment methods on mobile apps.