The money earned while not knowing that it is prohibited can be used. If you knew it was haram, you can only use what is necessary for you.

Read more

This is prohibited as it involves RIBA as such private institutions give interests.

Read more

You must not use credit cards unless you charge it with the amount you are going to use before you actually use it!

Read more

No, one must not help interest based banks in their evil!

Read more