diff --git a/lib/pact/cli/run_pact_verification.rb b/lib/pact/cli/run_pact_verification.rb
index 97d32492..203f11ef 100644
--- a/lib/pact/cli/run_pact_verification.rb
+++ b/lib/pact/cli/run_pact_verification.rb
@@ -72,7 +72,8 @@ def pact_spec_options
           criteria: SpecCriteria.call(options),
           format: options[:format],
           out: options[:out],
-          ignore_failures: options[:ignore_failures]
+          ignore_failures: options[:ignore_failures],
+          request_customizer: options[:request_customizer]
         }
       end
     end
diff --git a/lib/pact/provider/pact_spec_runner.rb b/lib/pact/provider/pact_spec_runner.rb
index d1dbc4ec..7db51560 100644
--- a/lib/pact/provider/pact_spec_runner.rb
+++ b/lib/pact/provider/pact_spec_runner.rb
@@ -120,7 +120,8 @@ def initialize_specs
         pact_sources.each do | pact_source |
           options = {
             criteria: @options[:criteria],
-            ignore_failures: @options[:ignore_failures]
+            ignore_failures: @options[:ignore_failures],
+            request_customizer: @options[:request_customizer]
           }
           honour_pactfile pact_source.uri, ordered_pact_json(pact_source.pact_json), options
         end
diff --git a/lib/pact/provider/rspec.rb b/lib/pact/provider/rspec.rb
index d9883bef..e6e8507a 100644
--- a/lib/pact/provider/rspec.rb
+++ b/lib/pact/provider/rspec.rb
@@ -85,7 +85,7 @@ def describe_interaction interaction, options
               interaction_context.run_once :before do
                 Pact.configuration.logger.info "Running example '#{Pact::RSpec.full_description(example)}'"
                 set_up_provider_state interaction.provider_state, options[:consumer]
-                replay_interaction interaction
+                replay_interaction interaction, options[:request_customizer]
                 interaction_context.last_response = last_response
               end
             end
diff --git a/lib/pact/provider/test_methods.rb b/lib/pact/provider/test_methods.rb
index 76486685..c46b6100 100644
--- a/lib/pact/provider/test_methods.rb
+++ b/lib/pact/provider/test_methods.rb
@@ -14,8 +14,9 @@ module TestMethods
       include Pact::Logging
       include Rack::Test::Methods
 
-      def replay_interaction interaction
+      def replay_interaction interaction, request_customizer = nil
         request = Request::Replayable.new(interaction.request)
+        request = request_customizer.call(request, interaction) if request_customizer
         args = [request.path, request.body, request.headers]
 
         logger.info "Sending #{request.method.upcase} request to path: \"#{request.path}\" with headers: #{request.headers}, see debug logs for body"