Transferable LC proceeding

Hi Experts, How are you ? I he a latest question, the background is that i he a potential deal. The cusotmer wants to do deferred payment of LC and he is not aware that i am actually working as middle person, while i am on behalf of one supplier. So do i need to ask for the permission of customer for doing Transferable LC in my own for when it's not necessory to do so, supposing i am ineed working with the supplier as the customer think now ? PS, i he my own offshore bank account. Is this doable ? Waiting for you