diff --git a/src/libs/sanitizeLogParams.ts b/src/libs/sanitizeLogParams.ts
index bf4e6ff9b17e..6949f6aa8330 100644
--- a/src/libs/sanitizeLogParams.ts
+++ b/src/libs/sanitizeLogParams.ts
@@ -15,6 +15,8 @@ const SENSITIVE_KEYS = new Set([
     'oldDotAutoGeneratedPassword',
     'apiKey',
     'clientSecret',
+    'cardNumber',
+    'cardCVV',
 ]);
 
 const REDACTED = '<redacted>';
diff --git a/tests/unit/sanitizeLogParamsTest.ts b/tests/unit/sanitizeLogParamsTest.ts
new file mode 100644
index 000000000000..fc6cbe8a23a7
--- /dev/null
+++ b/tests/unit/sanitizeLogParamsTest.ts
@@ -0,0 +1,70 @@
+import sanitizeLogParams, {sanitizeUrlForLogging} from '@libs/sanitizeLogParams';
+
+describe('sanitizeLogParams', () => {
+    it('redacts known sensitive keys', () => {
+        const result = sanitizeLogParams({authToken: 'secret', password: 'hunter2', token: 'abc'});
+        expect(result).toEqual({authToken: '<redacted>', password: '<redacted>', token: '<redacted>'});
+    });
+
+    it('redacts card number and CVV so payment card details never reach the logs', () => {
+        const result = sanitizeLogParams({
+            command: 'AddPaymentCard',
+            data: {
+                cardNumber: '4111111111111111',
+                cardCVV: '123',
+                cardMonth: '04',
+                cardYear: '2030',
+                addressZip: '94105',
+            },
+        });
+
+        expect(result).toEqual({
+            command: 'AddPaymentCard',
+            data: {
+                cardNumber: '<redacted>',
+                cardCVV: '<redacted>',
+                cardMonth: '04',
+                cardYear: '2030',
+                addressZip: '94105',
+            },
+        });
+    });
+
+    it('leaves non-sensitive keys untouched', () => {
+        const result = sanitizeLogParams({policyID: '1', currency: 'USD'});
+        expect(result).toEqual({policyID: '1', currency: 'USD'});
+    });
+
+    it('redacts sensitive keys nested inside arrays', () => {
+        const result = sanitizeLogParams({cards: [{cardNumber: '4111111111111111'}, {cardNumber: '5500000000000004'}]});
+        expect(result).toEqual({cards: [{cardNumber: '<redacted>'}, {cardNumber: '<redacted>'}]});
+    });
+
+    it('stops recursing past the max depth', () => {
+        const deep = {a: {b: {c: {d: {e: {f: {cardNumber: '4111111111111111'}}}}}}};
+        const result = sanitizeLogParams(deep);
+
+        // Beyond depth 5 the sanitizer returns the object as-is, so the deeply-nested value is not redacted.
+        expect(result.a.b.c.d.e.f.cardNumber).toBe('4111111111111111');
+    });
+
+    it('returns primitives unchanged', () => {
+        expect(sanitizeLogParams('plain string')).toBe('plain string');
+        expect(sanitizeLogParams(42)).toBe(42);
+        expect(sanitizeLogParams(null)).toBeNull();
+    });
+});
+
+describe('sanitizeUrlForLogging', () => {
+    it('redacts the validate code in /v/:accountID/:validateCode paths', () => {
+        expect(sanitizeUrlForLogging('/v/12345/abcdef')).toBe('/v/12345/<redacted>');
+    });
+
+    it('redacts the validate code in /u/:accountID/:validateCode paths', () => {
+        expect(sanitizeUrlForLogging('/u/12345/abcdef')).toBe('/u/12345/<redacted>');
+    });
+
+    it('strips the query string', () => {
+        expect(sanitizeUrlForLogging('https://example.com/path?authToken=secret')).toBe('https://example.com/path?<redacted>');
+    });
+});