Credits let you resupply your ammo and equipment, get upgrades, and improve yourself when you’re in Prague. Money isn’t very useful during your missions away from the city, so make sure to spend well when you’re in town so that you have everything you need later on.
Selling Unnecessary Items
The number one way to accrue money is to sell items you don’t need at any of the stores around Prague. Spare weapons are very expensive. As long as you’re careful not to sell your favorite upgraded weaponry, this is a superb way to get rich. Bring back Pistols, Machine Pistols, Revolvers, Stun Guns, and other extra weapons then walk away with a few thousand credits. That goes a long way toward purchasing attachments, better ammo, or saving toward a new Praxis Kit.
Never buy weaponry. It’s always easier to wait and then find things on your enemies or in weapon storage areas. All of the best items are available at some point in the story missions, so dropping thousands of credits on a gun is usually a waste.
Because extra guns of the same type get converted into ammo, you should sell common weapons as often as possible to make the most cash.
Looting Bodies and Searching
Some enemies are carrying money. You get credits from them, and you also grab credits from sticks that are all over the world. However, these are usually small amounts and supplement only part of your income. The main reason to search bodies is for Pocket Secretaries (for info) and to get ammunition.
Extra Hacking
Hacking data nodes unlocks spare software, XP, or money. These aren’t huge bonuses, but they’re often quick to snag if you’re already deep into a system. Wait until your path through the system is almost done and then backtrack to get any data nodes that you’ve missed.