This setting enabled Link on Billing Email field. As soon as user types email the Link begins to detects to check if Stripe has a saved profile. By activating the Link feature, Stripe leverages your customer's email address to ascertain whether they have previously utilized Stripe services. In the affirmative, their payment details, along with billing and shipping information, are automatically employed to populate the checkout page. This streamlined process not only enhances conversion rates but also minimizes customer friction. Enabling Link ensures that the Stripe payment form is utilized exclusively, as it is the sole card form compatible with this feature.