If he buys an item and pays the price and has something left with the seller

No File Exists
Check below answers in case you are looking for other related questions:
Cashing cheques through a financial services company in return for commission
Ruling on what gold retailers do of taking the gold from the wholesalers and paying for it in instalments

No File Exists
Related Answers:
Repent to Allaah and you do not have to hasten to pay off the riba-based loan
Ruling on buying gold over the phone and receiving it one or two days later
The correct way of dealing for those whose business is money transfer
Cashing cheques through a financial services company in return for commission
Ruling on what gold retailers do of taking the gold from the wholesalers and paying for it in instalments

Recommended answers for you:
She has gone off him and doesn't want to have any intimacy with him in bed
Ruling on smoking various types of hasheesh (marijuana)
How to pray istikhaarah
Conditions of women going out to the mosque
Ruling on taking boyfriends or girlfriends