Is the system of the Jordan Islamic Bank based on selling or usury (riba), and what are the Sharia violations found therein, if any?

The basic principle for Islamic banks is that they operate according to the provisions of Islamic law, but they vary in their degree of adherence to these provisions. Dealing with them is generally permissible, unless it is proven to the client that the bank conducts a specific transaction that violates Islamic law. In such a case, it is not permissible to engage in that particular transaction with the bank, but this does not mean abandoning all dealings with it. The sale conducted by Islamic banks is a "murabaha sale for the one who commands the purchase."