To help developers reduce friction in Secure Payment Confirmation flows, we are removing the user activation requirement. Spam and clickjacking mitigations are put in place to mitigate security and privacy risks with this change.
Docs: https://docs.google.com/document/d/1DW4hGyuVzcN8sE8TC3YOkg6xO4XpUGZQNxcHgfMXVwA
Samples: https://rsolomakhin.github.io/pr/spc-activationless