diff --git a/src/ZcashHaskell/Sapling.hs b/src/ZcashHaskell/Sapling.hs
index 5db9f06..0a25661 100644
--- a/src/ZcashHaskell/Sapling.hs
+++ b/src/ZcashHaskell/Sapling.hs
@@ -40,6 +40,7 @@ import ZcashHaskell.Types
   , DecodedNote(..)
   , RawData(..)
   , RawTxResponse(..)
+  , SaplingInternalReceiver
   , SaplingReceiver
   , SaplingSpendingKey(..)
   , Seed(..)
@@ -93,7 +94,6 @@ instance FromJSON RawTxResponse where
           a <- o' .: "actions"
           pure $ RawTxResponse i h (getShieldedOutputs h) a ht c b
 
---
 -- | Attempts to obtain a sapling SpendingKey using a HDSeed
 genSaplingSpendingKey :: Seed -> Maybe SaplingSpendingKey
 genSaplingSpendingKey seed = do
@@ -103,7 +103,6 @@ genSaplingSpendingKey seed = do
   where
     res = withPureBorshVarBuffer (rustWrapperSaplingSpendingkey seed)
 
---
 -- | Attempts to generate a sapling Payment Address using an ExtendedSpendingKey and a Diversifier Index 
 genSaplingPaymentAddress :: SaplingSpendingKey -> Int -> Maybe SaplingReceiver
 genSaplingPaymentAddress extspk i =
@@ -114,3 +113,7 @@ genSaplingPaymentAddress extspk i =
     res =
       withPureBorshVarBuffer
         (rustWrapperSaplingPaymentAddress extspk (fromIntegral i))
+
+-- | Generate an internal Sapling address
+genSaplingInternalAddress :: SaplingSpendingKey -> Maybe SaplingInternalReceiver
+genSaplingInternalAddress sk = undefined
diff --git a/src/ZcashHaskell/Types.hs b/src/ZcashHaskell/Types.hs
index 41e41e8..7c14558 100644
--- a/src/ZcashHaskell/Types.hs
+++ b/src/ZcashHaskell/Types.hs
@@ -54,6 +54,9 @@ type OrchardSpendingKey = BS.ByteString
 -- | A Sapling receiver
 type SaplingReceiver = BS.ByteString
 
+-- | A Sapling internal receiver
+type SaplingInternalReceiver = BS.ByteString
+
 -- | An Orchard receiver
 type OrchardReceiver = BS.ByteString
 
diff --git a/test/Spec.hs b/test/Spec.hs
index b7a38ff..e6d6bc2 100644
--- a/test/Spec.hs
+++ b/test/Spec.hs
@@ -578,156 +578,17 @@ main = do
           ---print $ show xtpubk
         xtpubk `shouldBe` testpbk
     describe "Sapling SpendingKey test" $ do
-      let hdseed =
-            BS.pack $
-            [ 206
-            , 61
-            , 120
-            , 38
-            , 206
-            , 40
-            , 201
-            , 62
-            , 83
-            , 175
-            , 151
-            , 131
-            , 218
-            , 141
-            , 206
-            , 254
-            , 28
-            , 244
-            , 172
-            , 213
-            , 128
-            , 248
-            , 156
-            , 45
-            , 204
-            , 44
-            , 169
-            , 3
-            , 162
-            , 188
-            , 16
-            , 173
-            , 192
-            , 164
-            , 96
-            , 148
-            , 91
-            , 52
-            , 244
-            , 83
-            , 149
-            , 169
-            , 82
-            , 196
-            , 199
-            , 53
-            , 177
-            , 170
-            , 1
-            , 6
-            , 0
-            , 120
-            , 170
-            , 2
-            , 238
-            , 219
-            , 241
-            , 243
-            , 172
-            , 178
-            , 104
-            , 81
-            , 159
-            , 144
-            ]
-      --xit "Call function with parameters" $ do
-        --let msg = genSaplingSpendingKey (word8ArrayToByteString hdseed)
-        --let msgArr = BS.unpack msg
-        --if (length msgArr) == 169
-          --then True
-          --else False
       it "Generate Sapling spending key" $ do
         p <- generateWalletSeedPhrase
         let s = getWalletSeed p
         genSaplingSpendingKey <$> s `shouldNotBe` Nothing
     describe "Sapling Payment Address generation test" $ do
       it "Call genSaplingPaymentAddress" $ do
-        let hdseed1 =
-              [ 206
-              , 61
-              , 120
-              , 38
-              , 206
-              , 40
-              , 201
-              , 62
-              , 83
-              , 175
-              , 151
-              , 131
-              , 218
-              , 141
-              , 206
-              , 254
-              , 28
-              , 244
-              , 172
-              , 213
-              , 128
-              , 248
-              , 156
-              , 45
-              , 204
-              , 44
-              , 169
-              , 3
-              , 162
-              , 188
-              , 16
-              , 173
-              , 192
-              , 164
-              , 96
-              , 148
-              , 91
-              , 52
-              , 244
-              , 83
-              , 149
-              , 169
-              , 82
-              , 196
-              , 199
-              , 53
-              , 177
-              , 170
-              , 1
-              , 6
-              , 0
-              , 120
-              , 170
-              , 2
-              , 238
-              , 219
-              , 241
-              , 243
-              , 172
-              , 178
-              , 104
-              , 81
-              , 159
-              , 144
-              ] :: [Word8]
         p <- generateWalletSeedPhrase
         let s = getWalletSeed p
         genSaplingPaymentAddress (fromMaybe "" s) 0 `shouldNotBe` Nothing
       prop "Sapling receivers are valid" $
-        forAll genSapArgs $ \(i) -> prop_SaplingReceiver i
+        forAll genSapArgs $ \i -> prop_SaplingReceiver i
 
 -- | Properties
 prop_PhraseLength :: Int -> Property