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diff --git a/BatchPayment/Transport.pm b/BatchPayment/Transport.pm
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+package Business::BatchPayment::Transport;
+
+use Moose::Role;
+with 'Business::BatchPayment::Debug';
+
+requires 'upload';
+requires 'download';
+
+=head1 NAME
+
+Business::BatchPayment::Transport
+
+=head1 USAGE
+
+Business::BatchPayment::Processor classes must have a 'transport' attribute
+which does the Business::BatchPayment::Transport role (implements 'upload'
+and 'download').  The B::BP::Processor class can implement 'default_transport'
+to construct a B::BP::Transport object.
+
+'upload' must take a scalar argument containing the (correctly formatted)
+batch for upload.  On success, it may return nothing, or a scalar identifier
+for the batch (such as a serial number) if the gateway requires one.
+
+'download' takes the return value from 'upload' (if any) as its argument, 
+and returns any number of scalars containing batch files.  If there are no 
+batches available, it should return an empty list.
+
+Both of these methods should die on error.
+
+=cut
+
+1;