Update generated code for v309

Co-authored-by: Stripe OpenAPI <105521251+stripe-openapi[bot]@users.noreply.github.com>

OPENAPI_VERSION

@@ -1 +1 @@
-v299
+v309

lib/stripe/resources/tax/registration.rb

@@ -5,7 +5,7 @@ module Stripe
   module Tax
     # A Tax `Registration` lets us know that your business is registered to collect tax on payments within a region, enabling you to [automatically collect tax](https://stripe.com/docs/tax).
     #
-    # Stripe will not register on your behalf with the relevant authorities when you create a Tax `Registration` object. For more information on how to register to collect tax, see [our guide](https://stripe.com/docs/tax/registering).
+    # Stripe doesn't register on your behalf with the relevant authorities when you create a Tax `Registration` object. For more information on how to register to collect tax, see [our guide](https://stripe.com/docs/tax/registering).
     class Registration < APIResource
       extend Stripe::APIOperations::Create
       extend Stripe::APIOperations::List

test/stripe/generated_examples_test.rb

@@ -1365,6 +1365,17 @@ module Stripe
         )
         assert_requested :post, "#{Stripe.api_base}/v1/plans"
       end
+      should "support requests with args: amount, currency, interval, product2" do
+        Stripe::Plan.create(
+          {
+            amount: 2000,
+            currency: "usd",
+            interval: "month",
+            product: { name: "My product" },
+          }
+        )
+        assert_requested :post, "#{Stripe.api_base}/v1/plans"
+      end
     end
     context "Plan.delete" do
       should "support requests with args: id" do