What is credit card "Principal Amount"?

"Principal Amount" is the portion deposited from your credit card.

For example:
Client makes a deposit in the amount of 100 USD known as the Principal amount. 
During withdrawal submission, the maximum amount would be less or equivalent to 100 USD.

Primary withdrawal = 100 USD [Full Principal Amount]

2 times Primary withdrawal = 50 USD + 50 USD [Partition of Principal Amount]

What if the Client makes profits? Would the client be able to withdraw more than the "Principal Amount"? 
The answer is Yes, client may withdraw the profits with Primary + Secondary withdrawal

For example:
Client makes a deposit in the amount of 100 USD known as the Principal amount. Meanwhile, profits with the amount of 219.53 USD.
Total funds in client's account = 319.53 USD

Primary withdrawal = 100 USD
Secondary withdrawal = 219.53 USD by using other methods such as  E-wallets or Bank transfer