If your Stripe account is based in the European Economic Area (EEA) and you currently use Stripe Billing, we strongly recommend upgrading your integration in order to prevent SCA-related declines.
All of the changes in our migration guide are backwards-compatible and do not require upgrading your API version.
Businesses based outside of the EEA that use Stripe Billing are not required to complete this migration.
Strong Customer Authentication (SCA) Preparation and Resources