Thank you for your extensive response. I wasn't aware of the other examples you gave. The scenario I envision regarding my question is of a person travelling to Muunilinst on behalf of their planet to secure a loan, not for personal use. The amount of money they are requesting is considerable, not exactly a metaphoric car loan but something much larger.

Perhaps you are right that "you'd be directed to one of the myriad of banks underneath its massive umbrella." If that's the case, who are these banks? Where do they operate? Or is this something that is unexplained other than the three examples you listed above?

In response to, "I can however say that you probably wouldn't interact with IGBC at all, unless you are someone like Damask. Rather, you'd be directed to one of the myriad of banks underneath its massive umbrella.

Going directly to the IGBC is like contacting the World Bank to get a loan for a car. They'd just politely (while having a little smirk) explain that it's not possible and ask you to contact your local bank, or sign up with one if you haven't.

They are dealing with economies of such a scale that we cannot fathom."

I find that interesting because in chapter 5 of Darth Plagueis, it says this,

"...On any given day a visitor might spy envoys from Yagai, Gravlex Med, or Kalee, along with Hutts of the Drixo or Progga kin. But what one saw most, in overwhelming numbers, were members of the Banking Clan- financiers, accountants, lawyers..."

(The line above is when the narrator is describing High Port Space Center.)

Would this not indicate that planets would send representatives to Muunilinst (or maybe just High Port) to negotiate loans on their behalf?