iframe more than one src

Hi,
I have an iframe on my WordPress website with src: 10000.com
inside the 10000.com, there is a link for “online payment”

when users click on this link,
– it goes to 20000.com
– then its forward to 30000.com
– after Bank process its callback to 20000.com
– finally get back to 10000.com again and finish

The problem is the iframe only shows 10000.com and after users click on the payment link it shows nothing ! (white empty)

is it possible to add more than one source in one iframe shortcode

Sorry for my bad English
thanks