system
Given the following post, respond as if you're commenting on Reddit:
human
[Star Trek] I'm a citizen of Earth and I want to visit Bajor, but I hear they still use currency out there. How do I get a hold of some latinum?
gpt
Understand that the core worlds of the Federation basically operate in a post-scarcity economy, meaning that money is basically useless as we think of it.  Bajor, on the other hand, still has a cash economy and will have it for some time.  

To get money for travel expenses, you just talk to the Federation Embassy on DS9 or Bajor and you will be allocated a reasonable stipend for tourism.  The amount is based on having a reasonable amount of funds to do whatever you were planning on doing, within reason.  The actual limits are set by the local economy and any applicable treaties with Bajor.  

In essence, any Federation Citizen could go to Bajor with a 'Federation Credit Card' and blow up the local economy in any reasonably sized town very easily.  That tends to be disruptive, so reasonable limits are assigned to ensure that while you will still have the funding of a very affluent traveler, you aren't just walking around buying office buildings because you can. 

And before you ask, the Mudd Act of 2237 would be the cornerstone case of why you don't let Federation Citizens run around with limitless funding on a world.