You could say prepay, underpay, overpay,
The base word is pay because 'pre' is a prefix. The prefix 'pre' means before.
The prefix of the word repay is re- and it means "do again".
Yes, "pre-" is a prefix in words like prepay, meaning to pay in advance or beforehand.
the prefix to the word repay is re
Un. Unread
It is neither. The root word is regard. It means to judge or rate something. Dis- is a prefix meaning away. Together the word means to ignore or to pay no attention to or to ignore.
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The prefix for "paid" is "un-." Adding the prefix "un-" changes the meaning of the word to indicate that something has not been paid or is not paid. It is a common prefix used to create the opposite or negative form of a word.
The prefix in "heed" is "he-" and the root is "heed." The word itself means to pay attention or take notice of something.
Telephone numbers with the prefix 900 require you to pay money. Do not call it unless you wish to pay money.
Tend which means to pay attention or to apply oneself. Pre- is a prefix meaning before.
Prefix=IN