diff --git a/app/controllers/api/v1/registrant/base_controller.rb b/app/controllers/api/v1/registrant/base_controller.rb
index 16980be8b6..d85368bbcb 100644
--- a/app/controllers/api/v1/registrant/base_controller.rb
+++ b/app/controllers/api/v1/registrant/base_controller.rb
@@ -54,6 +54,10 @@ def show_not_found_error
         def show_invalid_record_error(exception)
           render json: { errors: exception.record.errors }, status: :bad_request
         end
+
+        def company_register_api_enabled?
+          Setting.company_register_api_enabled
+        end
       end
     end
   end
diff --git a/app/controllers/api/v1/registrant/companies_controller.rb b/app/controllers/api/v1/registrant/companies_controller.rb
index d2060276d9..0c7a1f42dc 100644
--- a/app/controllers/api/v1/registrant/companies_controller.rb
+++ b/app/controllers/api/v1/registrant/companies_controller.rb
@@ -16,6 +16,8 @@ def index
         end
 
         def current_user_companies
+          return [:ok, []] unless company_register_api_enabled?
+
           [:ok, current_registrant_user.companies]
         rescue CompanyRegister::NotAvailableError
           [:service_unavailable, []]
diff --git a/app/controllers/api/v1/registrant/contacts_controller.rb b/app/controllers/api/v1/registrant/contacts_controller.rb
index 1c22277df7..a3b31bd224 100644
--- a/app/controllers/api/v1/registrant/contacts_controller.rb
+++ b/app/controllers/api/v1/registrant/contacts_controller.rb
@@ -35,11 +35,21 @@ def show
         end
 
         def do_need_update_contacts
+          unless company_register_api_enabled?
+            render json: { update_contacts: false, counter: 0 }
+            return
+          end
+
           result = current_registrant_user.do_need_update_contacts?
           render json: { update_contacts: result[:result], counter: result[:counter] }
         end
 
         def update_contacts
+          unless company_register_api_enabled?
+            render json: { message: 'get it', contacts: [] }
+            return
+          end
+
           contacts = current_registrant_user.update_contacts
 
           render json: { message: 'get it', contacts: contacts }
@@ -85,6 +95,7 @@ def representable_contact(uuid)
           contact = Contact.find_by(uuid: uuid, ident: current_registrant_user.ident,
                                     ident_type: 'priv', ident_country_code: country)
           return contact if contact
+          return nil unless company_register_api_enabled?
 
           Contact.find_by(uuid: uuid, ident_type: 'org', ident: company_codes,
                           ident_country_code: country)
@@ -97,6 +108,8 @@ def company_codes
         end
 
         def current_user_contacts
+          return current_registrant_user.direct_contacts unless company_register_api_enabled?
+
           current_registrant_user.contacts(representable: false)
         rescue CompanyRegister::NotAvailableError
           current_registrant_user.direct_contacts
diff --git a/app/controllers/api/v1/registrant/domains_controller.rb b/app/controllers/api/v1/registrant/domains_controller.rb
index 95475a4989..5840e326cb 100644
--- a/app/controllers/api/v1/registrant/domains_controller.rb
+++ b/app/controllers/api/v1/registrant/domains_controller.rb
@@ -53,12 +53,16 @@ def set_tech_flag
         end
 
         def current_user_domains_total_count
+          return current_registrant_user.direct_domains.count unless company_register_api_enabled?
+
           current_registrant_user.domains.count
         rescue CompanyRegister::NotAvailableError
           current_registrant_user.direct_domains.count
         end
 
         def current_user_domains
+          return init_count_of_direct_domains unless company_register_api_enabled?
+
           init_count_of_domains
         rescue CompanyRegister::NotAvailableError
           init_count_of_direct_domains
diff --git a/app/interactions/actions/contact_create.rb b/app/interactions/actions/contact_create.rb
index 782efdf9a4..6acc98f326 100644
--- a/app/interactions/actions/contact_create.rb
+++ b/app/interactions/actions/contact_create.rb
@@ -84,7 +84,7 @@ def validate_ident_birthday
     end
 
     def maybe_company_is_relevant
-      return true if ENV['allow_validate_business_contacts'] && ENV['allow_validate_business_contacts'] == 'false'
+      return true unless Setting.validate_business_contacts
       return true unless contact.org?
       return true unless contact.ident_country_code == 'EE'
 
diff --git a/db/migrate/20260410130124_add_validate_business_contacts_to_settings.rb b/db/migrate/20260410130124_add_validate_business_contacts_to_settings.rb
new file mode 100644
index 0000000000..a59af4d339
--- /dev/null
+++ b/db/migrate/20260410130124_add_validate_business_contacts_to_settings.rb
@@ -0,0 +1,17 @@
+class AddValidateBusinessContactsToSettings < ActiveRecord::Migration[6.1]
+  def up
+    safety_assured do
+      execute <<~SQL
+        INSERT INTO setting_entries (code, value, format, "group", created_at, updated_at)
+        SELECT 'validate_business_contacts', 'true', 'boolean', 'contacts', NOW(), NOW()
+        WHERE NOT EXISTS (SELECT 1 FROM setting_entries WHERE code = 'validate_business_contacts');
+      SQL
+    end
+  end
+
+  def down
+    safety_assured do
+      execute "DELETE FROM setting_entries WHERE code = 'validate_business_contacts';"
+    end
+  end
+end
diff --git a/db/migrate/20260413125925_add_company_register_api_enabled_to_settings.rb b/db/migrate/20260413125925_add_company_register_api_enabled_to_settings.rb
new file mode 100644
index 0000000000..ed099e855e
--- /dev/null
+++ b/db/migrate/20260413125925_add_company_register_api_enabled_to_settings.rb
@@ -0,0 +1,17 @@
+class AddCompanyRegisterApiEnabledToSettings < ActiveRecord::Migration[6.1]
+  def up
+    safety_assured do
+      execute <<~SQL
+        INSERT INTO setting_entries (code, value, format, "group", created_at, updated_at)
+        SELECT 'company_register_api_enabled', 'true', 'boolean', 'contacts', NOW(), NOW()
+        WHERE NOT EXISTS (SELECT 1 FROM setting_entries WHERE code = 'company_register_api_enabled');
+      SQL
+    end
+  end
+
+  def down
+    safety_assured do
+      execute "DELETE FROM setting_entries WHERE code = 'company_register_api_enabled';"
+    end
+  end
+end
diff --git a/db/structure.sql b/db/structure.sql
index f9fcd64f8c..c0806d0f66 100644
--- a/db/structure.sql
+++ b/db/structure.sql
@@ -1,8 +1,10 @@
 \restrict WmlyozFAnc1c6zHWXudb7s2jRC1uKwHPlCMDikRGHsbNPX1TGBaq3KQ01YXVO8T
 
+
 -- Dumped from database version 13.4 (Debian 13.4-4.pgdg110+1)
 -- Dumped by pg_dump version 13.23 (Debian 13.23-1.pgdg11+1)
 
+
 SET statement_timeout = 0;
 SET lock_timeout = 0;
 SET idle_in_transaction_session_timeout = 0;
@@ -5863,6 +5865,6 @@ INSERT INTO "schema_migrations" (version) VALUES
 ('20260406125446'),
 ('20260529120000'),
 ('20260601120000'),
-('20260608120000');
-
-
+('20260608120000'),
+('20260410130124'),
+('20260413125925');
diff --git a/test/fixtures/setting_entries.yml b/test/fixtures/setting_entries.yml
index 2df870258e..8b74f035c4 100644
--- a/test/fixtures/setting_entries.yml
+++ b/test/fixtures/setting_entries.yml
@@ -493,3 +493,19 @@ admin_contacts_allowed_ident_type:
   format: array
   created_at: <%= Time.zone.parse('2010-07-05') %>
   updated_at: <%= Time.zone.parse('2010-07-05') %>
+
+validate_business_contacts:
+  code: validate_business_contacts
+  value: 'true'
+  group: contacts
+  format: boolean
+  created_at: <%= Time.zone.parse('2010-07-05') %>
+  updated_at: <%= Time.zone.parse('2010-07-05') %>
+
+company_register_api_enabled:
+  code: company_register_api_enabled
+  value: 'true'
+  group: contacts
+  format: boolean
+  created_at: <%= Time.zone.parse('2010-07-05') %>
+  updated_at: <%= Time.zone.parse('2010-07-05') %>
diff --git a/test/integration/api/registrant/registrant_api_companies_test.rb b/test/integration/api/registrant/registrant_api_companies_test.rb
index 4f23aeac1d..b101035f5d 100644
--- a/test/integration/api/registrant/registrant_api_companies_test.rb
+++ b/test/integration/api/registrant/registrant_api_companies_test.rb
@@ -34,6 +34,18 @@ def test_format
     assert_equal(:companies, response_json.keys.first)
   end
 
+  def test_returns_empty_companies_when_company_register_api_disabled
+    Setting.company_register_api_enabled = 'false'
+
+    get '/api/v1/registrant/companies', headers: @auth_headers
+    response_json = JSON.parse(response.body, symbolize_names: true)
+
+    assert_equal(200, response.status)
+    assert_equal([], response_json[:companies])
+  ensure
+    Setting.company_register_api_enabled = 'true'
+  end
+
   private
 
   def auth_token
diff --git a/test/integration/api/registrant/registrant_api_contacts_test.rb b/test/integration/api/registrant/registrant_api_contacts_test.rb
index f3998a2e91..cd8ff3d29b 100644
--- a/test/integration/api/registrant/registrant_api_contacts_test.rb
+++ b/test/integration/api/registrant/registrant_api_contacts_test.rb
@@ -66,6 +66,19 @@ def test_gets_contact_domain_links_when_requested
 
     assert_empty expected_links - response_json[:links]
   end
+
+  def test_returns_only_direct_contacts_when_company_register_api_disabled
+    Setting.company_register_api_enabled = 'false'
+
+    get '/api/v1/registrant/contacts', headers: @auth_headers
+    assert_equal(200, response.status)
+
+    response_json = JSON.parse(response.body, symbolize_names: true)
+    assert response_json.is_a?(Array)
+  ensure
+    Setting.company_register_api_enabled = 'true'
+  end
+
   private
 
   def auth_token
diff --git a/test/integration/api/registrant/registrant_api_domains_test.rb b/test/integration/api/registrant/registrant_api_domains_test.rb
index a8801f1b4a..bca8f3fd5b 100644
--- a/test/integration/api/registrant/registrant_api_domains_test.rb
+++ b/test/integration/api/registrant/registrant_api_domains_test.rb
@@ -153,6 +153,18 @@ def test_details_returns_401_without_authorization
     assert_equal({ errors: [base: ['Not authorized']] }, json_body)
   end
 
+  def test_returns_only_direct_domains_when_company_register_api_disabled
+    Setting.company_register_api_enabled = 'false'
+
+    get '/api/v1/registrant/domains', headers: @auth_headers
+    assert_equal(200, response.status)
+
+    response_json = JSON.parse(response.body, symbolize_names: true)
+    assert response_json[:domains].is_a?(Array)
+  ensure
+    Setting.company_register_api_enabled = 'true'
+  end
+
   private
 
   def auth_token
diff --git a/test/integration/repp/v1/contacts/create_test.rb b/test/integration/repp/v1/contacts/create_test.rb
index a57e0d0d7c..a821846ee8 100644
--- a/test/integration/repp/v1/contacts/create_test.rb
+++ b/test/integration/repp/v1/contacts/create_test.rb
@@ -222,7 +222,7 @@ def object.simple_data(registration_number:)
   end
 
   def test_skip_company_validation_if_flag_is_set
-    ENV['allow_validate_business_contacts'] = 'false'
+    Setting.validate_business_contacts = false
     original_new_method = CompanyRegister::Client.method(:new)
     CompanyRegister::Client.define_singleton_method(:new) do
       object = original_new_method.call
@@ -253,7 +253,7 @@ def object.simple_data(registration_number:)
     assert_equal 'Command completed successfully', json[:message]
 
     CompanyRegister::Client.define_singleton_method(:new, original_new_method)
-    ENV['allow_validate_business_contacts'] = 'true'
+    Setting.validate_business_contacts = true
   end
 
 
diff --git a/test/interactions/actions/contact_create_test.rb b/test/interactions/actions/contact_create_test.rb
new file mode 100644
index 0000000000..ac58f82b9f
--- /dev/null
+++ b/test/interactions/actions/contact_create_test.rb
@@ -0,0 +1,47 @@
+require 'test_helper'
+
+class Actions::ContactCreateTest < ActiveSupport::TestCase
+  setup do
+    @contact = contacts(:acme_ltd)
+    @contact.ident_country_code = 'EE'
+    @ident = { ident: @contact.ident,
+               ident_type: @contact.ident_type,
+               ident_country_code: @contact.ident_country_code }
+  end
+
+  teardown do
+    Setting.validate_business_contacts = 'true'
+  end
+
+  def test_maybe_company_is_relevant_returns_true_when_toggle_disabled
+    Setting.validate_business_contacts = 'false'
+
+    @contact.stub :return_company_status, ->(*) { flunk 'company register must not be called' } do
+      action = Actions::ContactCreate.new(@contact, nil, @ident)
+      assert_equal true, action.maybe_company_is_relevant
+    end
+
+    epp_msgs = @contact.errors.where(:epp_errors).map { |e| e.options[:msg] }
+    assert_empty epp_msgs
+  end
+
+  def test_maybe_company_is_relevant_checks_register_when_toggle_enabled_and_company_registered
+    Setting.validate_business_contacts = 'true'
+
+    @contact.stub :return_company_status, Contact::REGISTERED do
+      action = Actions::ContactCreate.new(@contact, nil, @ident)
+      assert_equal true, action.maybe_company_is_relevant
+    end
+  end
+
+  def test_maybe_company_is_relevant_adds_error_when_toggle_enabled_and_company_missing
+    Setting.validate_business_contacts = 'true'
+
+    @contact.stub :return_company_status, 'N' do
+      action = Actions::ContactCreate.new(@contact, nil, @ident)
+      action.maybe_company_is_relevant
+      error_texts = @contact.errors.where(:epp_errors).map { |e| e.options[:msg] }
+      assert(error_texts.any? { |msg| msg.to_s.include?(I18n.t('errors.messages.company_not_registered')) })
+    end
+  end
+end