Master wrote a reminder for me, because the contract period of many shops in our shopping mall is coming, so we should inform them to pay the fees. What is better?

I'm writing to you because you didn't pay my money in time (you didn't repay the arrears in time), as follows:

On XX, XX, XX, you signed the XXXX Contract with me (or reached an oral agreement through negotiation). Both parties agree to pay 30% of the payment for the goods when they arrive at you (you should repay the arrears of XX yuan on XX, XX). On XX, XX, XX, I delivered the goods to your company as agreed, but you failed to pay in time as agreed, and now you owe XX yuan (but you failed to repay in time as agreed, and now you owe XX yuan).

In my opinion, since both sides have agreed in advance, long-term friendly cooperation can only be realized if we do our best to keep our promises. Therefore, I am writing to ask you to pay the money you owe me before XX.

I am here to convey

welcome

XXX

Date, year and month