If you want to increase sales, review your customers’ payment history and look for those who have paid well. Call or contact their buyers and tell them their company pays very well, our company appreciate the business and we are raising their credit limit from $ 5,000 to $10,000. (you enter the dollar amount increase). At this point, email this acknowledgement to their purchasing buyer’s attention and copy their AP contact. Do this on a regular basis for good paying customers. Is you target the buyers, you most likely will get more sales. A notice to their AP department will do nothing to gain sales. They may or may not tell the buyer. Make sure the buyer knows he can buy more from you on credit.