#2. The distributor accepts the products and gives the dealer a receipt.
#3. The distributor will either (a) give a credit to the dealer's account, or, (b) will give the dealer money for the products, if the dealer owns nothing to the distributor.
The credit mentioned here is an accounting term - The distributor will credit the account with $15.00. The amount the dealer has is increased by $15.00 and the amount of money the distributor has is lessened (goes down) by $15.00.