How I can apply for an Apple Card if I'm living in Italy?

You will have several challenges. The first is you’re required to be a legal resident of US and have a physical address in US. Secondly, you need a US driver’s license or State issued ID and it must be current and match the US address you use.

How to apply for Apple Card - Apple Support

Did you read what I wrote? Did you read the information and instructions at the link I posted?