remove unused imports

src/PaymentServer/Main.hs

@@ -10,13 +10,10 @@ import Network.Wai.Handler.Warp
   ( run
   )
 import Network.Wai.Middleware.RequestLogger
-  ( OutputFormat(Detailed, CustomOutputFormatWithDetails)
+  ( OutputFormat(Detailed)
   , outputFormat
   , mkRequestLogger
   )
-import Network.Wai.Middleware.RequestLogger.JSON
-  ( formatAsJSON
-  )
 import PaymentServer.Persistence
   ( memory
   )