Add route to catch pre-existing payments which may still use Checkout#edit as return URL

config/routes.rb

@@ -86,6 +86,10 @@ Openfoodnetwork::Application.routes.draw do
     end
   end
 
+  # Temporary re-routing for any pending Stripe payments still using the old return URL
+  match '/checkout', via: :get, controller: "payment_gateways/stripe", action: "confirm",
+        constraints: ->(request) { request["payment_intent"]&.start_with?("pm_") }
+
   get '/checkout', to: 'checkout#edit'
   put '/checkout', to: 'checkout#update', as: :update_checkout
   get '/checkout/:state', to: 'checkout#edit', as: :checkout_state

spec/routing/stripe_spec.rb

@@ -0,0 +1,24 @@
+# frozen_string_literal: true
+
+require "spec_helper"
+
+describe "routing for Stripe return URLS", type: :routing do
+  before do
+    allow_any_instance_of(SplitCheckoutConstraint).to receive(:current_user) { build(:user) }
+  end
+
+  it "routes /checkout to checkout#edit" do
+    expect(get: "checkout").
+      to route_to("checkout#edit")
+  end
+
+  it "routes /checkout?test=123 to checkout#edit" do
+    expect(get: "/checkout?test=123").
+      to route_to(controller: "checkout", action: "edit", test: "123")
+  end
+
+  it "routes /checkout?payment_intent=pm_123 to payment_gateways/stripe#confirm" do
+    expect(get: "/checkout?payment_intent=pm_123").
+      to route_to(controller: "payment_gateways/stripe", action: "confirm", payment_intent: "pm_123")
+  end
+end