diff --git a/CHANGELOG.md b/CHANGELOG.md
index 38bd59e..57ee4e7 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,8 @@
 ## [Unreleased]
 
+- Refactor `relying_party_key` into `Warden::WebAuthn::RackHelpers`
+  - https://github.com/ruby-passkeys/warden-webauthn/issues/4
+
 ## [0.1.0] - 2023-02-04
 
 - Initial release
diff --git a/lib/warden/webauthn.rb b/lib/warden/webauthn.rb
index e9718a8..fa51fa4 100644
--- a/lib/warden/webauthn.rb
+++ b/lib/warden/webauthn.rb
@@ -2,6 +2,7 @@
 
 require_relative "webauthn/version"
 require_relative "webauthn/error_key_finder"
+require_relative "webauthn/rack_helpers"
 require_relative "webauthn/strategy_helpers"
 require_relative "webauthn/strategy"
 require_relative "webauthn/authentication_initiation_helpers"
diff --git a/lib/warden/webauthn/rack_helpers.rb b/lib/warden/webauthn/rack_helpers.rb
new file mode 100644
index 0000000..acb9764
--- /dev/null
+++ b/lib/warden/webauthn/rack_helpers.rb
@@ -0,0 +1,17 @@
+# frozen_string_literal: true
+
+module Warden
+  module WebAuthn
+    # Helpers that can be mixed in to any Rack middleware or application, in order
+    # to setup the environment for `Warden::WebAuthn`, such as the Relying Party
+    module RackHelpers
+      def relying_party_key
+        "warden.webauthn.relying_party"
+      end
+
+      def set_relying_party_in_request_env
+        request.env[relying_party_key] = relying_party
+      end
+    end
+  end
+end
diff --git a/lib/warden/webauthn/strategy_helpers.rb b/lib/warden/webauthn/strategy_helpers.rb
index 87434a5..4f1ede3 100644
--- a/lib/warden/webauthn/strategy_helpers.rb
+++ b/lib/warden/webauthn/strategy_helpers.rb
@@ -7,6 +7,7 @@ module WebAuthn
     # Helpers that can be mixed in to any WebAuthn-related code, such as custom strategies or
     # an app's authentication flow
     module StrategyHelpers
+      prepend RackHelpers
       class NoStoredCredentialFound < StandardError; end
 
       # rubocop:disable Metrics/MethodLength
diff --git a/test/warden/test_rack_helpers.rb b/test/warden/test_rack_helpers.rb
new file mode 100644
index 0000000..1d16d3e
--- /dev/null
+++ b/test/warden/test_rack_helpers.rb
@@ -0,0 +1,53 @@
+# frozen_string_literal: true
+
+require "test_helper"
+
+class Warden::TestRackHelpers < Minitest::Test
+  class TestClass
+    include Warden::WebAuthn::RackHelpers
+
+    attr_accessor :request
+
+    def initialize
+      self.request = Rack::Request.new({})
+    end
+  end
+
+  class CustomizedClass
+    include Warden::WebAuthn::RackHelpers
+
+    attr_accessor :request
+
+    def initialize
+      self.request = Rack::Request.new({})
+    end
+
+    def relying_party_key
+      "custom_relying_party"
+    end
+
+    def relying_party
+      "dummy_relying_party_value"
+    end
+  end
+
+  def test_default_keys
+    assert_equal "warden.webauthn.relying_party", TestClass.new.relying_party_key
+  end
+
+  def test_custom_keys
+    assert_equal "custom_relying_party", CustomizedClass.new.relying_party_key
+  end
+
+  def test_raises_name_error_if_no_relying_party_method
+    assert_raises NameError do
+      TestClass.new.set_relying_party_in_request_env
+    end
+  end
+
+  def test_raises_uses_defined_relying_party_method
+    instance = CustomizedClass.new
+    instance.set_relying_party_in_request_env
+    assert_equal "dummy_relying_party_value", instance.request.env["custom_relying_party"]
+  end
+end