diff --git a/script/load_test b/script/load_test
new file mode 100755
index 0000000..b05b614
--- /dev/null
+++ b/script/load_test
@@ -0,0 +1,105 @@
+#!/usr/bin/env ruby
+# frozen_string_literal: true
+
+require "net/http"
+require "json"
+require "uri"
+
+# Configuration
+TARGET_URL = "http://0.0.0.0:8080/webhooks/hello"
+REQUEST_COUNT = 10_000 # Total number of requests to send
+EMPTY_JSON_BODY = "{}"
+
+# Parse the target URL
+uri = URI.parse(TARGET_URL)
+
+# Initialize statistics tracking
+response_times = []
+success_count = 0
+error_count = 0
+
+puts "Starting load test..."
+puts "Target: #{TARGET_URL}"
+puts "Requests: #{REQUEST_COUNT}"
+puts "Payload: #{EMPTY_JSON_BODY}"
+puts ""
+
+# Perform the load test
+REQUEST_COUNT.times do |i|
+  start_time = Time.now
+
+  begin
+    # Create HTTP connection
+    http = Net::HTTP.new(uri.host, uri.port)
+    http.use_ssl = false if uri.scheme == "http"
+
+    # Create POST request
+    request = Net::HTTP::Post.new(uri.path)
+    request["Content-Type"] = "application/json"
+    request.body = EMPTY_JSON_BODY
+
+    # Send request and measure time
+    response = http.request(request)
+    end_time = Time.now
+
+    response_time_ms = ((end_time - start_time) * 1000).round(2)
+    response_times << response_time_ms
+
+    if response.code.to_i >= 200 && response.code.to_i < 300
+      success_count += 1
+    else
+      error_count += 1
+    end
+
+    # Progress indicator
+    if (i + 1) % 100 == 0
+      puts "Completed #{i + 1}/#{REQUEST_COUNT} requests"
+    end
+
+  rescue => e
+    end_time = Time.now
+    response_time_ms = ((end_time - start_time) * 1000).round(2)
+    response_times << response_time_ms
+    error_count += 1
+    puts "Error on request #{i + 1}: #{e.message}"
+  end
+end
+
+puts ""
+puts "Load test completed!"
+puts ""
+
+# Calculate statistics
+if response_times.any?
+  sorted_times = response_times.sort
+  average_time = (response_times.sum / response_times.length).round(2)
+  min_time = sorted_times.first
+  max_time = sorted_times.last
+  median_time = if sorted_times.length.odd?
+                  sorted_times[sorted_times.length / 2]
+                else
+                  ((sorted_times[sorted_times.length / 2 - 1] + sorted_times[sorted_times.length / 2]) / 2.0).round(2)
+                end
+
+  # Calculate percentiles
+  p95_index = (sorted_times.length * 0.95).ceil - 1
+  p99_index = (sorted_times.length * 0.99).ceil - 1
+  p95_time = sorted_times[p95_index]
+  p99_time = sorted_times[p99_index]
+
+  puts "=== RESULTS SUMMARY ==="
+  puts "Total requests: #{REQUEST_COUNT}"
+  puts "Successful requests: #{success_count}"
+  puts "Failed requests: #{error_count}"
+  puts "Success rate: #{((success_count.to_f / REQUEST_COUNT) * 100).round(2)}%"
+  puts ""
+  puts "=== RESPONSE TIME STATISTICS (ms) ==="
+  puts "Average: #{average_time} ms"
+  puts "Minimum: #{min_time} ms"
+  puts "Maximum: #{max_time} ms"
+  puts "Median:  #{median_time} ms"
+  puts "95th percentile: #{p95_time} ms"
+  puts "99th percentile: #{p99_time} ms"
+else
+  puts "No response times recorded!"
+end
diff --git a/spec/acceptance/config/endpoints/hello.yml b/spec/acceptance/config/endpoints/hello.yml
new file mode 100644
index 0000000..13c4a32
--- /dev/null
+++ b/spec/acceptance/config/endpoints/hello.yml
@@ -0,0 +1,2 @@
+path: /hello
+handler: Hello
diff --git a/spec/acceptance/config/puma.rb b/spec/acceptance/config/puma.rb
index c5cb415..6f645ac 100644
--- a/spec/acceptance/config/puma.rb
+++ b/spec/acceptance/config/puma.rb
@@ -4,9 +4,12 @@
 require "json"
 
 bind "tcp://0.0.0.0:8080"
+
 # single mode: https://github.com/puma/puma/blob/master/docs/deployment.md#single-vs-cluster-mode
 workers 0
 
+threads 0, 16 # the default
+
 log_formatter do |msg|
   timestamp = Time.now.strftime("%Y-%m-%dT%H:%M:%S.%L%z")
   {
diff --git a/spec/acceptance/plugins/handlers/hello.rb b/spec/acceptance/plugins/handlers/hello.rb
new file mode 100644
index 0000000..9ea840c
--- /dev/null
+++ b/spec/acceptance/plugins/handlers/hello.rb
@@ -0,0 +1,11 @@
+# frozen_string_literal: true
+
+class Hello < Hooks::Plugins::Handlers::Base
+  def call(payload:, headers:, config:)
+    {
+      status: "success",
+      handler: self.class.name,
+      timestamp: Time.now.iso8601
+    }
+  end
+end
diff --git a/spec/unit/lib/hooks/plugins/auth/hmac_spec.rb b/spec/unit/lib/hooks/plugins/auth/hmac_spec.rb
index 9e8b01c..fa12174 100644
--- a/spec/unit/lib/hooks/plugins/auth/hmac_spec.rb
+++ b/spec/unit/lib/hooks/plugins/auth/hmac_spec.rb
@@ -70,7 +70,8 @@ def valid_with(args = {})
           auth: {
             header: header,
             algorithm: "sha256",
-            format: "signature_only"
+            format: "signature_only",
+            secret_env_key: "HMAC_TEST_SECRET"
           }
         }
       end
@@ -78,7 +79,7 @@ def valid_with(args = {})
       let(:headers) { { header => signature } }
 
       it "returns true for a valid hash-only signature" do
-        # TODO
+        expect(valid_with(headers:, config:)).to be true
       end
 
       it "returns false for an invalid hash-only signature" do
@@ -104,13 +105,14 @@ def valid_with(args = {})
             format: "version=signature",
             version_prefix: "v0",
             payload_template: payload_template,
-            timestamp_tolerance: 300
+            timestamp_tolerance: 300,
+            secret_env_key: "HMAC_TEST_SECRET"
           }
         }
       end
 
       it "returns true for a valid versioned signature with valid timestamp" do
-        # TODO
+        expect(valid_with(headers:, config:)).to be true
       end
 
       it "returns false for an expired timestamp" do
@@ -153,10 +155,10 @@ def valid_with(args = {})
 
     context "with missing config values" do
       let(:headers) { { "X-Signature" => "sha256=" + OpenSSL::HMAC.hexdigest(OpenSSL::Digest.new("sha256"), secret, payload) } }
-      let(:config) { {} }
+      let(:config) { { auth: { secret_env_key: "HMAC_TEST_SECRET" } } }
 
       it "uses defaults and validates correctly" do
-        # TODO
+        expect(valid_with(headers:, config:)).to be true
       end
     end
 
@@ -404,7 +406,8 @@ def valid_with(args = {})
             format: "version=signature",
             version_prefix: "v0",
             payload_template: "v0:{timestamp}:{body}",
-            timestamp_tolerance: 300
+            timestamp_tolerance: 300,
+            secret_env_key: "HMAC_TEST_SECRET"
           }
         }
       end
@@ -464,7 +467,14 @@ def valid_with(args = {})
       end
 
       it "returns true when timestamp header name case differs due to normalization" do
-        # TODO
+        timestamp = Time.now.to_i.to_s
+        signing_payload = "v0:#{timestamp}:#{payload}"
+        signature = "v0=" + OpenSSL::HMAC.hexdigest(OpenSSL::Digest.new("sha256"), secret, signing_payload)
+
+        # Use uppercase timestamp header name in the request headers
+        headers = { header => signature, timestamp_header.upcase => timestamp }
+
+        expect(valid_with(headers:, config: base_config)).to be true
       end
     end