The payment is due at the end of the month.

A sum of money given in exchange for goods or services.
She made the payment online.
The payment was processed quickly.
He received a payment for his work.
late payment
monthly payment
initial payment
remittance
settlement
disbursement
I made a payment for my new phone.

A sum of money given for goods or services.
She made a payment for her groceries.
The payment was due on the first of the month.
I received a payment for my freelance work.
online payment
monthly payment
late payment
fee
charge
remittance