Tamagotchi P´s : Stamp cards and (Happy) letters

[RubyLullaby]

Hello everyone

I have two questions:

What are Stamp cards in the Tamagotchi P´s?

What are (Happy) letters?

I´m not sure, you can download them.

I appreciate any help ^_^

I could not find any information

 

[jirachi-potato]

Stamp cards are a little bonus you can get. You need to download an item to your P's and have a separate P's visit yours and use it.

Happy letters (if i'm not mistaken) are just letters that you can read. I don't know if this is how they're used on the P's but if I remember, the iD L uses them in this way. ;_;