AT89C51AC2-SLSUM

                  PayPal

PayPal was founded in 1998 and is headquartered in California, USA. As one of the world's largest online payment companies, PayPal provides online payment and financial services to over 200 million users. PayPal supports 25 currencies, covering over 200 countries and regions, allowing global users to easily make cross-border payments.

          Western Union

Western Union, also known as Western Union, is a leading express remittance company in the world with a history of 150 years. It has the world's largest and most advanced electronic remittance financial network, and its agency branches are located in nearly 200 countries and regions. Xilian Company is a subsidiary of First Data Company (FDC), one of the Fortune 500 companies in the United States.

            DHL Express

    DHL Express is a division of the German logistics company Deutsche Post DHL   providing international express mail services. Deutsche Post is the world's   largest logistics company operating around the world. DHL is a world market   leader in sea and air mail.

United Parcel Service of North   America, Inc., typically referred to and branded as UPS (stylized as ups), is   the largest shipment and logistics company in the world. The American global   package delivery company is headquartered in Sandy Springs, Georgia, which is   part of the Greater Atlanta metropolitan area. UPS delivers more than 15   million packages a day to more than 6.1 million customers in more than 220   countries and territories around the world.

        Fedex Corporation

FedEx Corporation is an American   global courier delivery services company headquartered in Memphis, Tennessee.   The name "FedEx" is a syllabic abbreviation of the name of the   company's original air division, Federal Express, which was used from 1973   until 2000.