Name on Rakuten Debit Card

Hi there!

I tried looking online for some answers to my question, but to no avail, so here goes.

I’m about to apply for a Rakuten Debit Card, then eventually a Credit Card (so help me God) and then get into Rakuten Securities.

Now, as I’m filling up the form on opening a Rakuten Bank Account, I won’t be able to use my full name on my debit card since my whole name’s 19 characters long excluding the spaces. I have two first names, and then a middle name. On the 名前 part of the お客さま情報, I was able to input my whole first name and middle name in together with spaces, so it’s just the name on the debit card’s the problem.

Let’s say the initials of my first name are A.L. and my middle initial’s C.

Following Rakuten’s Guide on shortening names, should I just enter 「LAST NAME A.」 or 「LAST NAME. A.L.C.」?

Has someone gone through the same problem? Please help!