3D Secure 2 (3DS2), the newest iteration of 3D Secure, introduces a frictionless flow that allows customers to complete the 3D Secure authentication process without redirecting them from the checkout flow if the transaction is deemed eligible by their bank.
Transaction eligibility for frictionless flow is dependent on the card issuer and is assessed on a per-transaction basis.
Transactions that are not eligible for the frictionless flow and require authentication will be presented with a modal to complete the authentication process.