Drop-in component Definition.

Prebuilt integration component provided by a PSP (Adyen Drop-in, Stripe Payment Element, Braintree Drop-in) that automatically displays the available payment methods and handles data collection, redirects, and 3-D Secure with minimal code. It usually relies on hosted fields in iframes, which keeps the merchant in a reduced PCI scope. It is the usual middle ground between a hosted payment page, which is simple but hard to customize, and a full API integration, which is flexible but compliance-heavy.