Please navigate to the below link for more documentation and video tutorial for using X-Pay-Token:
Visa In-App Provisioning (VIAP) uses Field Level Encryption (FLE). Please send an email to firstname.lastname@example.org to request for the encryption key and test data for sandbox testing. Thank you.
Was your question answered? Don't forget to click on "Accept as Solution" to help other devs find the answer to the same question.