20 $ to the person who solves this problem for me

I have a site card Openbox 1.4, do I sell products that require payment before download

The problem is that after completing the payment page , Return URL does not allow to end basket successfully and go to download later

because the customer record out of the site in the new return URL and dont allow to end basket successfully with the knowledge that the payment was made

What is the solution?? Show $ 20 in any way to pay for those who help me to solve the problem and thank you

my Return URL : http://www.mysite.com/index.php?route=checkout/success

give me your email address please

if you still need helppass me your email address and i can do this for you, thanks