diff --git a/src/Web/Stripe/Charge.hs b/src/Web/Stripe/Charge.hs
--- a/src/Web/Stripe/Charge.hs
+++ b/src/Web/Stripe/Charge.hs
@@ -120,6 +120,7 @@
 
 data CreateCharge
 type instance StripeReturn CreateCharge = Charge
+instance StripeHasParam CreateCharge ExpandParams
 instance StripeHasParam CreateCharge CustomerId
 instance StripeHasParam CreateCharge NewCard
 instance StripeHasParam CreateCharge TokenId
diff --git a/src/Web/Stripe/Subscription.hs b/src/Web/Stripe/Subscription.hs
--- a/src/Web/Stripe/Subscription.hs
+++ b/src/Web/Stripe/Subscription.hs
@@ -107,6 +107,7 @@
 data CreateSubscription
 type instance StripeReturn CreateSubscription = Subscription
 instance StripeHasParam CreateSubscription CouponId
+instance StripeHasParam CreateSubscription Prorate
 instance StripeHasParam CreateSubscription TrialEnd
 instance StripeHasParam CreateSubscription CardId
 instance StripeHasParam CreateSubscription Quantity
diff --git a/src/Web/Stripe/Types.hs b/src/Web/Stripe/Types.hs
--- a/src/Web/Stripe/Types.hs
+++ b/src/Web/Stripe/Types.hs
@@ -128,7 +128,7 @@
     , chargeCreated              :: UTCTime
     , chargeLiveMode             :: Bool
     , chargePaid                 :: Bool
-    , chargeAmount               :: Int
+    , chargeAmount               :: Amount
     , chargeCurrency             :: Currency
     , chargeRefunded             :: Bool
     , chargeCreditCard           :: Card
@@ -157,7 +157,7 @@
                <*> (fromSeconds <$> o .: "created")
                <*> o .: "livemode"
                <*> o .: "paid"
-               <*> o .: "amount"
+               <*> (Amount <$> o .: "amount")
                <*> o .: "currency"
                <*> o .: "refunded"
                <*> o .: "card"
diff --git a/stripe-core.cabal b/stripe-core.cabal
--- a/stripe-core.cabal
+++ b/stripe-core.cabal
@@ -1,5 +1,5 @@
 name:                stripe-core
-version:             2.1.0
+version:             2.2.0
 synopsis:            Stripe API for Haskell - Pure Core
 license:             MIT
 license-file:        LICENSE
@@ -16,11 +16,11 @@
     <<https://stripe.com/img/navigation/logo@2x.png>>
     .
     [Pure API Wrapper]
-    `stripe-core` provides a complete binding to the Stripe API. `stripe-core` provides pure wrappers around all the Stripe API objects and methods. `stripe-core` is pure and is not tied to any particular HTTP client library. End users will typically install the `stripe` package which pulls in the `stripe-http-streams` library to obtain a complete set of functionality.
+    `stripe-core` provides a complete binding to the Stripe API. `stripe-core` provides pure wrappers around all the Stripe API objects and methods. `stripe-core` is pure and is not tied to any particular HTTP client library. End users will typically install the `stripe-haskell` package which pulls in the `stripe-http-streams` library to obtain a complete set of functionality.
 
 library
   hs-source-dirs:      src
-  build-depends:       aeson                >= 0.8   && < 0.10 || == 0.11.*
+  build-depends:       aeson                >= 0.8 && < 0.10 || >= 0.11 && < 1.1
                      , base                 >= 4.7   && < 5
                      , bytestring           >= 0.10  && < 0.11
                      , mtl                  >= 2.1.2 && < 2.3