Which track should be written on the magnetic stripe card during production?

Magnetic stripe card productionIn the middle, you need to write which track is on it
    Magnetic stripe cards are a very commonly used type of card in daily life. Their main storage information is by writing to the magnetic track, and generally writing to the second track. The first track mainly records numbers. The second track mainly records numbers and letters. The third track mainly records letters.

Track 1: Its data standards were initially established by the International Air Transportation Association (IATA). Data and letters on Track 1 record automated information in air transport, such as cargo tag information, transaction information, ticket booking/seat reservations, and more. This information is processed and read by specialized magnetic stripe cards and processed by devices, and airlines have an application system to serve this purpose. The application system includes a database where all the data and information created by magnetic stripe cards can be found and recorded.
Track 2: Its data standard was originally established by the American Bankers Association (ABA). The information on this track has already been adopted by many banking systems today. It contains some basic relevant information, such as the card's unique identification number and the card's validity period.
Track 3: Its data standards were initially developed by the Finance Industry (THRIFT). It is mainly used in general savings, payments, and credit units, where frequent changes or rewriting of magnetic stripe card data are required. Typical applications include cash vending machines, prepaid cards (systems), debit cards (systems), and so on. Many of these applications operate in an "offline" mode, meaning the banking (verification) system finds it difficult to track the data generated in real time on magnetic stripe cards, resulting in differences between the data on the user's card and the current data recorded by the banking (verification) system.