No idea what kind of barcode generator a bank uses. But if it's just about getting barcode images, there are many ways to do so. Make sure what type you wanna generate, then get that barcode font installed to ur system. Other available ways include barcode generating library, control, add-in and VBA,etc. The following link might give you some idea, you can download a free demo and try it out too:
keepautomation.com/how_to/csharp/