Is it permissible to purchase poultry farm supplies on credit — with a price increase compared to a cash purchase — if the farm owner does not possess the cash price?

There is no objection to purchasing on credit as long as the price and a specific due date are agreed upon. An increase in price for credit sales compared to cash sales is permissible. However, the impermissibility lies in increasing the price upon late payment, or linking the price to the payment time such that it increases as the time extends.