How are TPPs authenticated? March 13, 2019 14:39 Updated finAPI XS2A authenticates TPPs using a QWAC certificate. There is no registration process for TPPs. Related articles How are TPPs authenticated? Which PSU SCA authentication flows are supported? 04. How to Create and Authorise a Consent Which API standard is supported by finAPI XS2A? Which account types are supported in the Sandbox?