I was able to learn the overall contents related to payment using iamport. Above all, I think the lectures have incorporated the key points that can be applied directly to the actual work well. The series of processes of putting a product in the shopping cart, paying, verifying the payment status, and canceling it are well covered. Among the many lectures I have paid for recently, this was a lecture that I did not regret spending money on. However, in terms of implementing an actual shopping mall, I felt that the contents of the above steps covered in the lectures were concise and only included the key parts, which was disappointing. I wish there had been more lectures on various situations that would occur in the actual work. For example, implementing payment by anonymous users is a really worrisome scenario. The current lecture alone is different from other lectures, but I hope that it will be updated with supplementary contents added little by little so that it will become a lecture that I visit many times. It was a lecture that I would actively recommend to people around me.