3.16.3

[+] added "Pay in X time" feature for FR/UK/US/DE/AU
[+] Improve the message about "merchant id" set-up in BO
[+] fixed issue with guest payment
[+] Fixed issues with address for virtual products
[+] Fixed issues with Invalid cart in the context
[+] Bugfix express button
[+] fixed rounding issue with PS1.5