Add message on customer login and registration PS 1.7.4.4

[Geimsdin]

Hi,

I'm trying to understand how to display a message to customers when they login or they register in PRESTASHOP 1.7.4.4. I would rather avoid to use the notification system of prestashop and intercept on tpl but I'm not finding the right variable passed for this events.

Can someone help me?

Thanks a lot in advance,

Simone