Stop storing now redundant redirect URL

The Taler gem now computes it from the order id. No need to store it.

app/models/spree/payment_method/taler.rb

@@ -38,10 +38,9 @@ module Spree
 
         payment.source ||= self
         payment.response_code ||= create_taler_order(payment)
-        payment.redirect_auth_url ||= taler_order.status_url
         payment.save! if payment.changed?
 
-        payment.redirect_auth_url
+        taler_order.status_url
       end
 
       # Main method called by Spree::Payment::Processing during checkout

spec/fixtures/vcr_cassettes/Spree_PaymentMethod_Taler/_external_payment_url/retrieves_a_URL_to_pay_at.yml

@@ -1,106 +0,0 @@
----
-http_interactions:
-- request:
-    method: post
-    uri: https://backend.demo.taler.net/instances/sandbox/private/orders
-    body:
-      encoding: UTF-8
-      string: '{"order":{"amount":"KUDOS:5","summary":"OFN Order","fulfillment_url":"https://ofn.example.net"},"create_token":false}'
-    headers:
-      Authorization:
-      - "<HIDDEN-AUTHORIZATION-HEADER>"
-      Accept:
-      - application/json
-      User-Agent:
-      - Taler Ruby
-      Content-Type:
-      - application/json
-      Accept-Encoding:
-      - gzip;q=1.0,deflate;q=0.6,identity;q=0.3
-  response:
-    status:
-      code: 200
-      message: OK
-    headers:
-      Server:
-      - nginx/1.26.3
-      Date:
-      - Thu, 15 Jan 2026 04:18:27 GMT
-      Content-Type:
-      - application/json
-      Content-Length:
-      - '42'
-      Connection:
-      - keep-alive
-      Access-Control-Allow-Origin:
-      - "*"
-      Access-Control-Expose-Headers:
-      - "*"
-      Cache-Control:
-      - no-store
-      Via:
-      - 1.1 Caddy
-      Strict-Transport-Security:
-      - max-age=63072000; includeSubDomains; preload
-    body:
-      encoding: UTF-8
-      string: |-
-        {
-          "order_id": "2026.015-02T676V4VARMT"
-        }
-  recorded_at: Thu, 15 Jan 2026 04:18:28 GMT
-- request:
-    method: get
-    uri: https://backend.demo.taler.net/instances/sandbox/private/orders/2026.015-02T676V4VARMT
-    body:
-      encoding: US-ASCII
-      string: ''
-    headers:
-      Authorization:
-      - "<HIDDEN-AUTHORIZATION-HEADER>"
-      Accept:
-      - application/json
-      User-Agent:
-      - Taler Ruby
-      Accept-Encoding:
-      - gzip;q=1.0,deflate;q=0.6,identity;q=0.3
-  response:
-    status:
-      code: 200
-      message: OK
-    headers:
-      Server:
-      - nginx/1.26.3
-      Date:
-      - Thu, 15 Jan 2026 04:18:29 GMT
-      Content-Type:
-      - application/json
-      Content-Length:
-      - '336'
-      Connection:
-      - keep-alive
-      Access-Control-Allow-Origin:
-      - "*"
-      Access-Control-Expose-Headers:
-      - "*"
-      Cache-Control:
-      - no-store
-      Via:
-      - 1.1 Caddy
-      Strict-Transport-Security:
-      - max-age=63072000; includeSubDomains; preload
-    body:
-      encoding: ASCII-8BIT
-      string: |-
-        {
-          "taler_pay_uri": "taler://pay/backend.demo.taler.net/instances/sandbox/2026.015-02T676V4VARMT/",
-          "order_status_url": "https://backend.demo.taler.net/instances/sandbox/orders/2026.015-02T676V4VARMT",
-          "order_status": "unpaid",
-          "total_amount": "KUDOS:5",
-          "summary": "OFN Order",
-          "creation_time": {
-            "t_s": 1768450707
-          }
-        }
-  recorded_at: Thu, 15 Jan 2026 04:18:29 GMT
-recorded_with: VCR 6.3.1

spec/models/spree/payment_method/taler_spec.rb

@@ -12,14 +12,14 @@ RSpec.describe Spree::PaymentMethod::Taler do
   let(:backend_url) { "https://backend.demo.taler.net/instances/sandbox" }
 
   describe "#external_payment_url", vcr: true do
-    it "retrieves a URL to pay at and stores it on the payment record" do
+    it "creates an order reference and retrieves a URL to pay at" do
       order = create(:order_ready_for_confirmation, payment_method: taler)
+
       url = subject.external_payment_url(order:)
-      expect(url).to start_with backend_url
+      expect(url).to eq "#{backend_url}/orders/2026.022-0284X4GE8WKMJ"
 
       payment = order.payments.last.reload
       expect(payment.response_code).to match "2026.022-0284X4GE8WKMJ"
-      expect(payment.redirect_auth_url).to eq url
     end
   end
 

spec/system/consumer/checkout/payment_spec.rb

@@ -358,13 +358,13 @@ RSpec.describe "As a consumer, I want to checkout my order" do
                 .to receive(:create).and_return(taler_order_id)
 
               # And fake the payment status to avoid user interaction.
-              allow_any_instance_of(Taler::Client)
-                .to receive(:fetch_order) do
+              allow_any_instance_of(Taler::Order)
+                .to receive(:status_url) do
                   payment = Spree::Payment.last
-                  url = payment_gateways_confirm_taler_path(payment_id: payment.id)
-
-                  { "order_status_url" => url, "order_status" => "paid" }
+                  payment_gateways_confirm_taler_path(payment_id: payment.id)
               end
+              allow_any_instance_of(Taler::Order)
+                .to receive(:fetch).with("order_status").and_return("paid")
             end
 
             it_behaves_like "different payment methods", "Taler"