I wish to know PDT identity token information. Is it need to remove ! ! on the viart "Parameter Source"
 
I mean '!' is in the viart/admin/payment system/paypal / Parameter Source character
 
And I found the paypal system page, it have a Image function. I try to put my company logo in both "small " and "large" image.
 
But when I set it , I test in sandbox, it didnt show my company logo.
 
Any ideas or suggest is welcome
 
Thanks