Open
Description
Namely 3:
I do not understand what does the first one do. The second one is very clear because it is not just abstract "Cancel". The one on the bottom is very confusing when the payment details are not open - it looks like "Cancel this pending payment". It seems to me that the bottom two buttons Cancel/OK have exactly the same function and the same effect is achieved by clicking on X in the top right corner or just outside the modal. I would get rid of them completely to avoid confusion.
Not sure what should be done about the first Cancel - either renamed to make it clear or eliminate if it is not necessary.