Charging Option is a term used to describe the various payment methods available for customers. Two of the most popular options are VISA and American Express, both of which are four-letter abbreviations. VISA is a global payments technology company that enables consumers, businesses, financial institutions, and governments to use digital currency. American Express is a multinational financial services corporation that provides credit cards, charge cards, and traveler's cheques. Both VISA and American Express offer secure and convenient payment options for customers.