An issuer identification number contains the starting digits of a credit card number.
The issuer identification number accepts up to six digits. After the valid values, TDM adds any number from 0 to 9. For example, the issuer identification number for a Visa card is 4. So, TDM can generate data such as 4X, 4XX, 4XXX, 4XXXX, 4XXXXX, and so on.
If you do not specify a number, TDM generates data based on the valid issuer identification numbers for the corresponding issuing networks. If you provide a valid value, TDM generates data based on the issuer identification number. If you provide a value that is not valid, the workflow fails to run.
The following table shows the valid issuer identification numbers for different issuing networks: