Add functions to update managed accounts

lib/stripe/accounts.ex

@@ -109,6 +109,33 @@ defmodule Stripe.Accounts do
     |> Stripe.Util.handle_stripe_response
   end
 
+  @doc """
+  Updates an Account with the given parameters - all of which are optional.
+  ## Example
+  ```
+    new_fields = [
+      email: "new_email@test.com"
+    ]
+    {:ok, res} = Stripe.Accounts.update(account_id, new_fields)
+  ```
+  """
+  def update(account_id, params) do
+    update(account_id, params, Stripe.config_or_env_key)
+  end
+
+  @doc """
+  Updates an Account with the given parameters - all of which are optional.
+  Using a given stripe key to apply against the account associated.
+  ## Example
+  ```
+  {:ok, res} = Stripe.Accounts.update(account_id, new_fields, key)
+  ```
+  """
+  def update(account_id, params, key) do
+    Stripe.make_request_with_key(:post, "#{@endpoint}/#{account_id}", key, params)
+    |> Stripe.Util.handle_stripe_response
+  end
+
   @max_fetch_size 100
   @doc """
   List all accounts.

test/stripe/account_test.exs

@@ -47,6 +47,28 @@ defmodule Stripe.AccountTest do
     end
   end
 
+  @tag disabled: false
+  test "Update w/key works", %{account: account} do
+    use_cassette "account_test/update_with_key", match_requests_on: [:query, :request_body] do
+      new_params = [email: "newemail@example.com"]
+      case Stripe.Accounts.update(account.id, new_params, Stripe.config_or_env_key) do
+        {:ok, res} -> assert res.email == "newemail@example.com"
+        {:error, err} -> flunk err
+      end
+    end
+  end
+
+  @tag disabled: false
+  test "Update works", %{account: account} do
+    use_cassette "account_test/update", match_requests_on: [:query, :request_body] do
+      new_params = [email: "newemail@example.com"]
+      case Stripe.Accounts.update(account.id, new_params) do
+        {:ok, res} -> assert res.email == "newemail@example.com"
+        {:error, err} -> flunk err
+      end
+    end
+  end
+
   test "Delete single works", %{account: account} do
     use_cassette "account_test/delete", match_requests_on: [:query, :request_body] do
       case Stripe.Accounts.delete account.id do