or download this
status: 400 at c:/tmp/t_data_printer.pl line 9.
field: merge_fields at c:/tmp/t_data_printer.pl line 10.
...
raw "{"type":"http://developer.mailchimp.com/documentation/m
+ailchimp/guides/error-glossary/","title":"Invalid Resource","status":
+400,"detail":"The resource submitted could not be validated. For fiel
+d-specific details, see the 'errors' array.","instance":"59edf1fc-ed9
+3-4a40-ba23-1f0af24a6eb3","errors":[{"field":"merge_fields","message"
+:"This value should be of type object."}]}"
}