regular payment

NOUN
15 LETTERS · STARTS WITH R

regular payment is a valid 15-letter word worth 22 points in Scrabble and 27 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS
R1E1G2U1L1A1R1P3A1Y4M3E1N1T1
1 + 1 + 2 + 1 + 1 + 1 + 1 + 0 + 3 + 1 + 4 + 3 + 1 + 1 + 1 =22 PTS
DOUBLE WORD → 44TRIPLE WORD → 66
MEANING

What does regular payment mean?