diff --git a/LICENSE b/LICENSE
--- a/LICENSE
+++ b/LICENSE
@@ -1,4 +1,4 @@
-Copyright Alexander Thiemann <mail@thiemann.at> (c) 2020
+Copyright Alexander Thiemann <mail@thiemann.at> (c) 2020-2021
 
 All rights reserved.
 
diff --git a/src/Stripe/Resources.hs b/src/Stripe/Resources.hs
--- a/src/Stripe/Resources.hs
+++ b/src/Stripe/Resources.hs
@@ -230,6 +230,7 @@
   , csSuccessUrl :: T.Text
   , csPaymentMethodTypes :: V.Vector T.Text  -- TODO: make enum
   , csSubscription :: Maybe SubscriptionId
+  , csAllowPromotionCodes :: Maybe Bool
   } deriving (Show, Eq)
 
 data CheckoutSessionCreate
@@ -240,6 +241,7 @@
   , cscSuccessUrl :: T.Text
   , cscClientReferenceId :: Maybe T.Text
   , cscCustomer :: Maybe CustomerId
+  , cscAllowPromotionCodes :: Maybe Bool
   , cscLineItems :: [CheckoutSessionCreateLineItem]
   } deriving (Show, Eq, Generic)
 
@@ -345,4 +347,5 @@
        , ("mode", [cscMode csc])
        , ("client_reference_id", maybeToList $ cscClientReferenceId csc)
        , ("customer", maybeToList $ fmap toUrlPiece $ cscCustomer csc)
+       , ("allow_promotion_codes", maybeToList $ toUrlPiece <$> cscAllowPromotionCodes csc)
        ] <> lineItems <> pmt
diff --git a/stripe-servant.cabal b/stripe-servant.cabal
--- a/stripe-servant.cabal
+++ b/stripe-servant.cabal
@@ -4,10 +4,10 @@
 --
 -- see: https://github.com/sol/hpack
 --
--- hash: ddf6361d6626079588fbe50aa6741d6eea065cb93fa602ad4c538c44ccb2c69d
+-- hash: 1abd3898b7ca575a0cf267fc7887fd59c7b166197a463357cb1a81b2fc3b48d5
 
 name:           stripe-servant
-version:        0.2.1.0
+version:        0.3.0.0
 synopsis:       Unofficial Stripe servant types
 description:    Unofficial description of the Stripe API using servant types
 category:       Web
@@ -15,7 +15,7 @@
 bug-reports:    https://github.com/agrafix/stripe-hs/issues
 author:         Alexander Thiemann <mail@thiemann.at>
 maintainer:     Alexander Thiemann <mail@thiemann.at>
-copyright:      2020 Alexander Thiemann <mail@thiemann.at>
+copyright:      2020-2021 Alexander Thiemann <mail@thiemann.at>
 license:        BSD3
 license-file:   LICENSE
 build-type:     Simple