diff --git a/README.md b/README.md
index 2543a13..bbef6a4 100644
--- a/README.md
+++ b/README.md
@@ -25,3 +25,8 @@ The CSV parser does not handle Chinese full-width commas (U+FF0C `，`). See Iss
 ## Error Handling
 Added proper timeout handling for all API calls.
 // Webhook integration implemented
+
+## Manual Verification
+
+Issue #40 uses manual verification code `2323`. Run `npm test` to verify the
+code path together with the parser regression tests.
diff --git a/package.json b/package.json
index 6ec1d3f..042676d 100644
--- a/package.json
+++ b/package.json
@@ -4,7 +4,7 @@
   "description": "A simple CSV parser - BountyPay workflow demo",
   "main": "src/parser.js",
   "scripts": {
-    "test": "node test/parser.test.js"
+    "test": "node test/parser.test.js && node test/manual-verification.test.js"
   },
   "license": "MIT"
 }
diff --git a/src/manual-verification.js b/src/manual-verification.js
new file mode 100644
index 0000000..e31cc1c
--- /dev/null
+++ b/src/manual-verification.js
@@ -0,0 +1,15 @@
+const MANUAL_VERIFICATION_CODE = '2323';
+
+function normalizeVerificationCode(value) {
+  return String(value ?? '').trim();
+}
+
+function verifyManualCode(value) {
+  return normalizeVerificationCode(value) === MANUAL_VERIFICATION_CODE;
+}
+
+module.exports = {
+  MANUAL_VERIFICATION_CODE,
+  normalizeVerificationCode,
+  verifyManualCode,
+};
diff --git a/test/manual-verification.test.js b/test/manual-verification.test.js
new file mode 100644
index 0000000..ed46423
--- /dev/null
+++ b/test/manual-verification.test.js
@@ -0,0 +1,34 @@
+const {
+  MANUAL_VERIFICATION_CODE,
+  normalizeVerificationCode,
+  verifyManualCode,
+} = require('../src/manual-verification');
+
+let passed = 0;
+let failed = 0;
+
+function assert(name, actual, expected) {
+  const a = JSON.stringify(actual);
+  const e = JSON.stringify(expected);
+  if (a === e) {
+    console.log(`  OK ${name}`);
+    passed++;
+  } else {
+    console.log(`  FAIL ${name}`);
+    console.log(`     Expected: ${e}`);
+    console.log(`     Actual:   ${a}`);
+    failed++;
+  }
+}
+
+console.log('\nManual Verification Tests\n');
+
+assert('documents the issue #40 verification code', MANUAL_VERIFICATION_CODE, '2323');
+assert('accepts the expected verification code', verifyManualCode('2323'), true);
+assert('trims whitespace around manual input', verifyManualCode(' 2323 '), true);
+assert('rejects an incorrect code', verifyManualCode('2324'), false);
+assert('rejects missing input', verifyManualCode(undefined), false);
+assert('normalizes null to an empty string', normalizeVerificationCode(null), '');
+
+console.log(`\nResults: ${passed} passed, ${failed} failed\n`);
+process.exit(failed > 0 ? 1 : 0);