diff --git a/stripe/api_resources/account.py b/stripe/api_resources/account.py
index e256ede7a..b578bff9e 100644
--- a/stripe/api_resources/account.py
+++ b/stripe/api_resources/account.py
@@ -41,16 +41,10 @@ def _build_instance_url(cls, sid):
     def instance_url(self):
         return self._build_instance_url(self.get('id'))
 
-    def reject(self, reason=None, idempotency_key=None):
+    def reject(self, idempotency_key=None, **params):
         url = self.instance_url() + '/reject'
         headers = util.populate_headers(idempotency_key)
-        if reason:
-            params = {"reason": reason}
-        else:
-            params = {}
-        self.refresh_from(
-            self.request('post', url, params, headers)
-        )
+        self.refresh_from(self.request('post', url, params, headers))
         return self
 
     def deauthorize(self, **params):
diff --git a/stripe/api_resources/charge.py b/stripe/api_resources/charge.py
index 8e1848464..6ae80d0c7 100644
--- a/stripe/api_resources/charge.py
+++ b/stripe/api_resources/charge.py
@@ -32,13 +32,13 @@ def update_dispute(self, idempotency_key=None, **params):
         self.refresh_from({'dispute': response}, api_key, True)
         return self.dispute
 
-    def close_dispute(self, idempotency_key=None):
+    def close_dispute(self, idempotency_key=None, **params):
         requestor = api_requestor.APIRequestor(self.api_key,
                                                api_version=self.stripe_version,
                                                account=self.stripe_account)
         url = self.instance_url() + '/dispute/close'
         headers = util.populate_headers(idempotency_key)
-        response, api_key = requestor.request('post', url, {}, headers)
+        response, api_key = requestor.request('post', url, params, headers)
         self.refresh_from({'dispute': response}, api_key, True)
         return self.dispute
 
diff --git a/stripe/api_resources/dispute.py b/stripe/api_resources/dispute.py
index fcd97cf96..c4bdcfba3 100644
--- a/stripe/api_resources/dispute.py
+++ b/stripe/api_resources/dispute.py
@@ -8,8 +8,8 @@
 class Dispute(ListableAPIResource, UpdateableAPIResource):
     OBJECT_NAME = 'dispute'
 
-    def close(self, idempotency_key=None):
+    def close(self, idempotency_key=None, **params):
         url = self.instance_url() + '/close'
         headers = util.populate_headers(idempotency_key)
-        self.refresh_from(self.request('post', url, {}, headers))
+        self.refresh_from(self.request('post', url, params, headers))
         return self
diff --git a/stripe/api_resources/invoice.py b/stripe/api_resources/invoice.py
index f7acd0f2e..d9ac83811 100644
--- a/stripe/api_resources/invoice.py
+++ b/stripe/api_resources/invoice.py
@@ -11,9 +11,10 @@ class Invoice(CreateableAPIResource, ListableAPIResource,
     OBJECT_NAME = 'invoice'
 
     def pay(self, idempotency_key=None, **params):
+        url = self.instance_url() + '/pay'
         headers = util.populate_headers(idempotency_key)
-        return self.request(
-            'post', self.instance_url() + '/pay', params, headers)
+        self.refresh_from(self.request('post', url, params, headers))
+        return self
 
     @classmethod
     def upcoming(cls, api_key=None, stripe_version=None, stripe_account=None,
diff --git a/stripe/api_resources/order.py b/stripe/api_resources/order.py
index 5c15a815b..3bfa8ea1e 100644
--- a/stripe/api_resources/order.py
+++ b/stripe/api_resources/order.py
@@ -17,9 +17,10 @@ def create(cls, **params):
         return super(Order, cls).create(**params)
 
     def pay(self, idempotency_key=None, **params):
+        url = self.instance_url() + '/pay'
         headers = util.populate_headers(idempotency_key)
-        return self.request(
-            'post', self.instance_url() + '/pay', params, headers)
+        self.refresh_from(self.request('post', url, params, headers))
+        return self
 
     def return_order(self, idempotency_key=None, **params):
         if "items" in params:
diff --git a/stripe/api_resources/payout.py b/stripe/api_resources/payout.py
index 8227c4573..eaaa395b6 100644
--- a/stripe/api_resources/payout.py
+++ b/stripe/api_resources/payout.py
@@ -1,5 +1,6 @@
 from __future__ import absolute_import, division, print_function
 
+from stripe import util
 from stripe.api_resources.abstract import CreateableAPIResource
 from stripe.api_resources.abstract import UpdateableAPIResource
 from stripe.api_resources.abstract import ListableAPIResource
@@ -9,6 +10,8 @@ class Payout(CreateableAPIResource, UpdateableAPIResource,
              ListableAPIResource):
     OBJECT_NAME = 'payout'
 
-    def cancel(self):
-        self.refresh_from(self.request('post',
-                          self.instance_url() + '/cancel'))
+    def cancel(self, idempotency_key=None, **params):
+        url = self.instance_url() + '/cancel'
+        headers = util.populate_headers(idempotency_key)
+        self.refresh_from(self.request('post', url, params, headers))
+        return self
diff --git a/stripe/api_resources/source.py b/stripe/api_resources/source.py
index 879d13c9f..8f3862257 100644
--- a/stripe/api_resources/source.py
+++ b/stripe/api_resources/source.py
@@ -13,15 +13,16 @@
 class Source(CreateableAPIResource, UpdateableAPIResource, VerifyMixin):
     OBJECT_NAME = 'source'
 
-    def detach(self, **params):
+    def detach(self, idempotency_key=None, **params):
         if hasattr(self, 'customer') and self.customer:
             extn = quote_plus(util.utf8(self.id))
             customer = util.utf8(self.customer)
             base = Customer.class_url()
             owner_extn = quote_plus(customer)
             url = "%s/%s/sources/%s" % (base, owner_extn, extn)
+            headers = util.populate_headers(idempotency_key)
 
-            self.refresh_from(self.request('delete', url, params))
+            self.refresh_from(self.request('delete', url, params, headers))
             return self
 
         else:
diff --git a/stripe/api_resources/transfer.py b/stripe/api_resources/transfer.py
index 92cdab749..9289b4270 100644
--- a/stripe/api_resources/transfer.py
+++ b/stripe/api_resources/transfer.py
@@ -1,5 +1,6 @@
 from __future__ import absolute_import, division, print_function
 
+from stripe import util
 from stripe.api_resources.abstract import CreateableAPIResource
 from stripe.api_resources.abstract import UpdateableAPIResource
 from stripe.api_resources.abstract import ListableAPIResource
@@ -12,6 +13,8 @@ class Transfer(CreateableAPIResource, UpdateableAPIResource,
                ListableAPIResource):
     OBJECT_NAME = 'transfer'
 
-    def cancel(self):
-        self.refresh_from(self.request('post',
-                          self.instance_url() + '/cancel'))
+    def cancel(self, idempotency_key=None, **params):
+        url = self.instance_url() + '/cancel'
+        headers = util.populate_headers(idempotency_key)
+        self.refresh_from(self.request('post', url, params, headers))
+        return self