Credits are what is used for money throughout the galaxy. Credits have no physical apearance, but are stored in Keycards. Keycards are filled with credits in your bank account, and have to be refilled when the Credits are depleted. Keycards change color depending on how many credits are stored. Blue is full to close to full, green is somewhat in the middle, and red is almost depleted and in need of a refill. If a keycard has absolutly no Credits in it at all, the Keycard turns grey and the bank charges a fine.