Mazumas were a form of currency.
History
By the 82nd century, Mazumas were the main form of currency across much of the galaxy. (COMIC: The Shape Shifter)
They were in use in on the planet Olleril in 5597. (PROSE: Tragedy Day)
Mazumas could be found in the form of coins available in denominations including one and twenty (AUDIO: The Maltese Penguin) as well as banknotes called "Universal Credits." (COMIC: The Shape Shifter)
The Sixth Doctor and Frobisher stole 250,000 Mazumas from Intra-Venus, Inc. (COMIC: The Shape Shifter) They gave them to Ivan Asimoff for the Zyglot trust. (COMIC: Polly the Glot)
Frobisher's rate for his services as a private investigator was 12 mazumas per day, plus expenses. (AUDIO: The Maltese Penguin)
Frobisher lent Jokk mazumas to take the shuttle. (COMIC: Where Nobody Knows Your Name)