Imagine you are part of a big group of friends who go on adventures together. You all work hard and do things like fight battles, build roads, and protect forts.
To keep things fair, everyone gets paid for their work. In the Roman army, they called this pay "stipendium." The amount you got paid depended on what job you were doing and how long you had been in the army.
If you were just starting out, you might get paid less than someone who had been in the army for a long time. And if you were doing a really important job, like leading other soldiers into battle, you might get paid more than the regular soldiers.
The Roman army was very organized, so they had a special group of people whose job was to make sure everyone got their pay on time. These people were called "paymasters."
But what did they use for money? They didn't have paper money like we do today. Instead, they used something called "denarii." Denarii were small silver coins with pictures of important people on them, like the emperor or a famous general.
When it was time to get paid, the paymasters would hand out bags of denarii to each soldier. The soldiers could then use the denarii to buy things they needed, like food or clothes.
So, in short, the Roman army paid its soldiers for their hard work using a special kind of money called denarii. The amount of pay depended on the job and how long the soldier had been in the army. And it was all organized by special people called paymasters.