For transactions within the scope of PSD2, you or Adyen can request for an SCA exemption if the transaction meets any of the criteria of the exemption list. By default Adyen will apply and request for the most suitable exemption type on your behalf. If you want to manage exemption requests on your own, see Managing PSD2 compliance.
The issuer decides if the exemption is granted or not. For some types of transaction, the issuer can grant an exemption without you or Adyen requesting for it.
Please refer to Possible SCA exemptions for an up-to-date list.