Customer group register & datepicker shipping

[LeoMosbih]

Hello world !

Begginner with Prestashop and web development, I can’t solve two problems :

• In user register, I want each account automatically affiliated to a customer group depends on mail suffix.
  Ex : when mail suffix is « Schneider », then affiliate this account to « Scheinder » customer group.
  I’ve got a backup solution : let the user choose his customer group during registration. I found this premium plugin but I would like to do it by myself.
  https://addons.prestashop.com/fr/gestion-clients/26680-customer-group-registration.html
   
• In shipping step, I want to integrate a date picker for each pick-up store. I found this plugin but I would like to do it by myself.
  https://addons.prestashop.com/fr/date-livraison/20307-delivery-dates-wizard-pro.html

Thank you for your time and you helps !