Design a new Credit Card system for DEF Inc with the following business requirements;

$-$ There are $2$ main customers that are the target users for the new system; individual and corporate customer.

$-$ Both type of customers should be able to perform their own credit card transaction in their respective categories $($corporate and individual credit card transaction$).$

$-$ Both type of customers should be able to use the new account management feature of the system to manage their account. They should be able to check and pay their account balance.

$-$Retail institutions can also use the new system to perform credit card transaction on behalf of their customers $($Individual and Corporate$).$