Use Strong Customer Authentication (SCA) to verify the buyer for one-time charges or for storing a customer card on file.
The In-App Payment SDK supports the Strong Customer Authentication (SCA) buyer verification flow for transactions where the buyer is present. When a buyer uses a payment card issued in the United Kingdom, the issuing bank might require your In-App Payments SDK application to challenge the buyer for additional identifying information. This can happen in a one-time charge when a card is stored on file with Square or when a stored card is used in a transaction.
To add the SCA flow to your application, complete the following steps to update your existing code. The In-App Payments SDK handles all the buyer verification logic and the verification UI. You provide the location ID, buyer contact name, and payment ID (the payment token or stored customer payment card ID) to the buyer verification method and the SDK completes the SCA flow to return a verification token to your application.