From 605b6060b31c834bb7931913a526e533de66a33d Mon Sep 17 00:00:00 2001
From: abhu85 <60182103+abhu85@users.noreply.github.com>
Date: Mon, 2 Mar 2026 15:06:55 +0000
Subject: [PATCH] feat(isCreditCard): add Maestro and InstaPayment card support

Add validation support for:
- Maestro cards (prefixes 5018, 5020, 5038, 6304, 6759, 6761, 6763)
- InstaPayment cards (prefixes 637, 638, 639)

Both card types are added as individual providers with proper tests.

Rescues stale PR #1701 (4.5 years old) by rebasing changes onto current
code structure. The original PR used a single regex approach, but the
codebase has since evolved to use individual provider regexes, so this
implementation follows the current pattern.

Original author: @avaly

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Co-Authored-By: avaly <3009556+avaly@users.noreply.github.com>
---
 src/lib/isCreditCard.js |  2 ++
 test/validators.test.js | 45 +++++++++++++++++++++++++++++++++++++++++
 2 files changed, 47 insertions(+)

diff --git a/src/lib/isCreditCard.js b/src/lib/isCreditCard.js
index 938679d39..8024fcfff 100644
--- a/src/lib/isCreditCard.js
+++ b/src/lib/isCreditCard.js
@@ -5,7 +5,9 @@ const cards = {
   amex: /^3[47][0-9]{13}$/,
   dinersclub: /^3(?:0[0-5]|[68][0-9])[0-9]{11}$/,
   discover: /^6(?:011|5[0-9][0-9])[0-9]{12,15}$/,
+  instapayment: /^63[7-9][0-9]{13}$/,
   jcb: /^(?:2131|1800|35\d{3})\d{11}$/,
+  maestro: /^(5018|5020|5038|6304|6759|6761|6763)[0-9]{8,15}$/,
   mastercard: /^5[1-5][0-9]{2}|(222[1-9]|22[3-9][0-9]|2[3-6][0-9]{2}|27[01][0-9]|2720)[0-9]{12}$/, // /^[25][1-7][0-9]{14}$/;
   unionpay: /^(6[27][0-9]{14}|^(81[0-9]{14,17}))$/,
   visa: /^(?:4[0-9]{12})(?:[0-9]{3,6})?$/,
diff --git a/test/validators.test.js b/test/validators.test.js
index bcb3f0044..f60dd3660 100644
--- a/test/validators.test.js
+++ b/test/validators.test.js
@@ -6382,11 +6382,15 @@ describe('Validators', () => {
         '4716989580001715211',
         '8171999927660000',
         '8171999900000000021',
+        '5018000000000009',
+        '6370000000000009',
       ],
       invalid: [
         'foo',
         'foo',
         '5398228707871528',
+        '637000000000000901',
+        '501800000000000901234567890',
         '2718760626256571',
         '2721465526338453',
         '2220175103860763',
@@ -6670,6 +6674,47 @@ describe('Validators', () => {
   });
 
 
+  it('should validate Maestro provided credit cards', () => {
+    test({
+      validator: 'isCreditCard',
+      args: [{ provider: 'Maestro' }],
+      valid: [
+        '5018000000000009',
+        '5020000000000005',
+        '5038000000000005',
+        '6304000000000000',
+        '6759000000000000',
+      ],
+      invalid: [
+        'foo',
+        '5019000000000000',
+        '4716461583322103',
+        '375556917985515',
+      ],
+    });
+  });
+
+
+  it('should validate InstaPayment provided credit cards', () => {
+    test({
+      validator: 'isCreditCard',
+      args: [{ provider: 'InstaPayment' }],
+      valid: [
+        '6370000000000009',
+        '6380000000000007',
+        '6390000000000005',
+      ],
+      invalid: [
+        'foo',
+        '6360000000000001',
+        '6400000000000002',
+        '4716461583322103',
+        '375556917985515',
+      ],
+    });
+  });
+
+
   it('should validate identity cards', () => {
     const fixtures = [
       {