The main reason to create a credit card number is to initiate software testing.
It acts like a real credit card but has no money in it.
The details generated via this tool are valid and work in most countries in the world.
The computer processes the data and then creates the card.
As a developer and tester, you have to make sure that your application handles card details correctly and that the system works as expected.
Valid testing purposes include testing the accuracy of the generated card data, e-mailing sample reports, and checking the performance of the software.