dsignr · October 22, 2017 09:34 · Sep 16, 2016 · Sep 16, 2016
diff --git a/IpnController.ex b/IpnController.ex
@@ -17,12 +17,12 @@ defmodule AppName.IpnController do
     pp_ack_uri = Enum.join(["https://www.sandbox.paypal.com/cgi-bin/webscr?cmd=_notify-validate", pp_query_string],"&")
 
     # Let it fly.
-    case HTTPoison.post(pp_ack_uri,'',[],[])
-      {:ok, response}
+    case HTTPoison.post(pp_ack_uri,'',[],[]) do
+      {:ok, response} ->
         IO.inspect(response)
         # Do business logic
-      {:error, message}
-        IO.inspect(message)
+      {:error, reason} ->
+        IO.inspect(reason)
         # Uh, oh.
     end
 

diff --git a/IpnController.ex b/IpnController.ex
@@ -0,0 +1,32 @@
+defmodule AppName.IpnController do
+  @moduledoc """
+  IPN Controller.
+  """
+
+  use AppName.Web, :controller
+
+  def create(conn, params) do
+    # PayPal requires the params returned in the exact order given.
+    # The map needs to be a list.  encode/1 keep the order of a list,
+    # but not a map. https://hexdocs.pm/plug/Plug.Conn.Query.html.
+    pp_query_string = Plug.Conn.Query.encode(
+      params |> Enum.to_list
+    )
+
+    # Join the URI (e.g., sandbox/prod) with the params)
+    pp_ack_uri = Enum.join(["https://www.sandbox.paypal.com/cgi-bin/webscr?cmd=_notify-validate", pp_query_string],"&")
+
+    # Let it fly.
+    case HTTPoison.post(pp_ack_uri,'',[],[])
+      {:ok, response}
+        IO.inspect(response)
+        # Do business logic
+      {:error, message}
+        IO.inspect(message)
+        # Uh, oh.
+    end
+
+    # Render a blank
+    html(conn,'')
+  end
+end
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