Even if you are not handling card data, for example when you are integrating with Pay by Link, you have to fill out a Prioritised Approach Tool (PAT). This is due to the upcoming end of life of Magneto 1 since June 30, 2020.
Typically, for our pay by link and HPP integrations Adyen does not require you to submit any PCI DSS documentation, as the cardholder information is managed in the Adyen hosted payment page. However, you have to be PCI DSS compliant at all times. Considering the increased risks of Magento 1 use, we will require you to complete a PAT in which you demonstrate that you are taking the necessary steps to mitigate any associated risks and have set out a timeline to migrate to a supported version or alternate platform by December 31, 2020.