Is there a word for the most granular parts of currency, eg, cents, pence, etc?

I am writing some instructions and I want my audience to understand that an amount must be entered in cents / pence / Eurocents / Satoshis etc. Is there a word that describes these small, granular parts of currency?

I'm dealing with non-physical objects, e.g. in an online payments system.

Solution 1:

They are usually referred to as the minor units of currency, or minor units for short. This refers to such things as pence - UK, cent USA & Eurozone, centimes Switzerland etc.

Solution 2:

According to TFD- change (n)

a. Money of smaller denomination given or received in exchange for money of higher denomination.

b. The balance of money returned when an amount given is more than what is due.

c. Coins: had change jingling in his pocket.