diff --git a/paypal-adaptive-hoops.cabal b/paypal-adaptive-hoops.cabal
--- a/paypal-adaptive-hoops.cabal
+++ b/paypal-adaptive-hoops.cabal
@@ -1,5 +1,5 @@
 name:                 paypal-adaptive-hoops
-version:              0.6.0.0
+version:              0.7.0.0
 author:               Ian Grant Jeffries
 maintainer:           ian@housejeffries.com
 category:             Web
@@ -30,7 +30,6 @@
                     , data-default >= 0.5   && < 0.6
                     , errors       >= 1.4   && < 1.5
                     , http-client  >= 0.4.2 && < 0.5
-                    , http-types   >= 0.8   && < 0.9
                     , lens         >= 4.6   && < 4.8
                     , lens-aeson   >= 1.0   && < 1.1
                     , text         >= 1.1   && < 1.3
diff --git a/src/Web/PayPal/Adaptive/Core.hs b/src/Web/PayPal/Adaptive/Core.hs
--- a/src/Web/PayPal/Adaptive/Core.hs
+++ b/src/Web/PayPal/Adaptive/Core.hs
@@ -24,7 +24,6 @@
 import           Data.Text.Read
 import           Data.Traversable
 import qualified Data.Vector          as V
-import           Network.HTTP.Client  (HttpException (NoResponseDataReceived))
 import           Network.Wreq
 
 --------------------------------------------------
@@ -61,8 +60,7 @@
         PpSandbox    -> "https://svcs.sandbox.paypal.com/AdaptivePayments/"
         PpProduction -> "https://svcs.paypal.com/AdaptivePayments/"
 
-    handler :: HttpException -> IO (Either AdaptiveErr (Response ByteString))
-    handler NoResponseDataReceived = return (Left AeNoResponse)
+    handler :: SomeException -> IO (Either AdaptiveErr (Response ByteString))
     handler e = return . Left . AeConnectionErr . T.pack . show $ e
 
     opts :: Options
@@ -102,13 +100,15 @@
 -- that this library doesn't support sending in the first place.
 -- TODO: is this actually how we're using it?
 --
--- AeNoSuchEmail is raised when the CreatePayment sender
--- email doesn't exist.
+-- Both AeInvalidCredentials and AeNoSuchEmail are just
+-- a convenient wrapper around certain AeErrCodes.
 data AdaptiveErr
-  = AeNoResponse
-  | AeConnectionErr   Text
+  = AeConnectionErr   Text
   | AeDecodeFailed    ByteString Text
+  -- | AeInvalidCredentials just a wrapper around an AeErrCodes Int.
   | AeInvalidCredentials
+  -- | AeNoSuchEmail is just a wrapper around an AeErrCodes Int.
+  -- It's raised when the CreatePayment sender email doesn't exist.
   | AeNoSuchEmail
   | AeErrCodes        [Int]
   | AePending         PayResp