this oughta do,

PHP Code:
//Redirect to API and back to store front 

    
$redirectTo "https://dart.fine-art.com/api/process.asp" 
    
"?userID=" $userID "&password=" $password "&action=" $action 
    
"&artistFirstName=" $artistFirstName "&artistLastName=" $artistLastName 
    
"&price=" $price "&title=" $title "&category=" $category "&urlArt=" 
    
$urlArt "&vendorCode=" $vendorCode "&subject1=" $subject1 "&subject2=" $subject2 "&subject3=" $subject3 .
    
"&media1=" $media1 "&media2=" $media2 "&media3=" $media3 "&urlReturn=" $urlReturn "&paypalEmail=" $paypalEmail .  "&watermark=" $watermark