what to do next

PaymentServer.cabal

@@ -17,6 +17,7 @@ library
   hs-source-dirs:      src
   exposed-modules:     PaymentServer.Processors.Stripe
                      , PaymentServer.Persistence
+                     , PaymentServer.Main
   build-depends:       base >= 4.7 && < 5
                      , aeson
                      , servant

app/Main.hs

-module Main where
+module Main
+  ( main
+  ) where
 
-main :: IO ()
-main = return ()
+import PaymentServer.Main
+  ( run
+  )
+
+main = run

src/PaymentServer/Main.hs

+module PaymentServer.Main
+  ( run
+  ) where
+
+run :: IO ()
+run =