Unescape paypal's content before parsing it so that multi-line data is handled correctly. Fixes bug #12103.

docs/changelog/7.x.x.txt

@@ -10,6 +10,7 @@
  - fixed #11955: Rich Text Editor for Forums doesn't work on the iPad
  - fixed #11992: html source editor
  - fixed #12100: Carousel and/or RichEdit
+ - fixed #12103: PayPalStd driver fails occasionally
 
 7.10.13
  - added #12079: Carousel Auto Play

lib/WebGUI/Shop/PayDriver/PayPal/PayPalStd.pm

@@ -287,8 +287,9 @@ sub processPayment {
         at  => $self->get('identityToken'),
     );
     my $response = LWP::UserAgent->new->post($self->payPalUrl, \%form);
-    my ($status, @lines) = split("\n", uri_unescape($response->content));
-    my %params = map { split /=/ } @lines;
+    my ($status, @lines) = split("\n", $response->content);
+    my %params = map { split /=/ }
+                 map { uri_unescape($_) } @lines;
 
     if ($status =~ /FAIL/) {
         my $message = '<table><tr><th>Field</th><th>Value</th></tr>';