I had an event happen to me :

What do I do with the Subeautique Invitation? Thanks in advance ^_^

having at least one redeemed into your currencies will allow you to enter the shop Subeautique, in Centropolis.

This invitation is a standing invitation and is usable for entry-into-shop multiple times, until you make one purchase of an item there for sP. Upon your purchase of the item your Invitation is punched/stamped/otherwise removed from your currencies and you will need to acquire another one if you wish to re-enter that shop.

Also it is a book you can read to your pets if you don't wish to redeem the invite.

Thank you very much for your detailed response, I really appreciate it ^_^

Thank you for the additional information! I very much appreciate it ^_^

you are welcome.