This cheat may not work on all versions of the game, specifically version 1.2. Save Editing & External Tools
If the profile cheat is unavailable, you can modify your save file or use memory editors:
This is the most popular way to get rich. You must find an account with a high balance (often found during "Trace a Balance Transfer" missions), transfer the money to your own account, and then meticulously delete the transfer logs in both the target's statement and your own to avoid being caught.
Always ask for more money or "half up front" when accepting missions to maximize early-game cash flow.
Start a new game and enter TooManySecrets as the name (case-sensitive).
You can use Cheat Engine to find the memory address for your current balance and change it to any amount.
While in the game, press F1 to bring up a secret menu that allows you to give your agent money and manage other stats.