ASP Classic magic!
the plot : a form is filled and submitted to 3rd party server, passing through also the SHA1 digest.
the problem : Server Response : Invalid Digest
the cause : first, make all form elements visible : 
for unknown reason the variable orderAmount on Location A appears with decimal symbol . (dot) where on Location B appears with decimal symbol , (comma).
origin - http://www.pipiscrew.com/?p=2422 asp-render-problem