ESTA registration is required for all travelers to the United States under the Visa Waiver Program. There is a US$14 fee for ESTA registration. The fee can be paid online using any of the following credit cards: Visa, MasterCard, American Express, or Discover. Third parties (travel agents, family members, etc.) can pay your ESTA fee for you if you do not have the correct type of credit card. If the ESTA registration is denied, the fee is only US$4.
If a traveler’s main reason for being in a country is simply to pass through en route to another final destination, the country may issue a transit visa. For example, Australia issues transit visas for stays up to 72 hours for people in transit and for crew members arriving to work on flight or ocean vessels. Most countries do not require visas for travelers who arrive to change planes but never leave the secure airport areas. However, a more restrictive kind of visa called an airside transit visa is required by some countries even for travelers who remain in the airport.
^ Encompasses Schengen member states - Austria, Belgium, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Italy, Latvia, Liechtenstein, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden and Switzerland as well as Bulgaria, Croatia, Cyprus and Romania and countries without border controls - Monaco, San Marino, Vatican and a country accessible only via Schengen area - Andorra.
Corporate, government and foreign credit cards are high risk.  They have the highest interchange rates.  You may ask why.  Simply, if someone from a foreign country buys an item here but refuses to pay for it later, perhaps because of a dispute, it is very difficult, sometimes almost impossible to get that money back.  Also, people in corporations and government make purchases that are not authorized by higher management.  If they quit or are terminated, these entities will often dispute the charges as unauthorized.  This makes these three card types high risk.
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