1 files changed, 13 insertions, 0 deletions
diff --git a/epirts.js b/epirts.js
index ad3044f..c7d4712 100644
--- a/epirts.js
+++ b/epirts.js
@@ -94,6 +94,19 @@ var Stripe = Epirts = (function() {
 		};
 
 		pub.cardType = function(number) {
+			var p;
+			var i;
+
+			/* Approximate IIN prefixes */
+			p = {};
+			for (i = 40; i <= 49; ++i) p[i] = 'Visa';
+			for (i = 51; i <= 55; ++i) p[i] = 'MasterCard';
+			p[34] = p[37] = 'American Express';
+			p[35] = 'JCB';
+			p[60] = p[62] = p[64] = p[65] = 'Discover';
+			p[30] = p[36] = p[38] = p[39] = 'Diners Club';
+
+			return p[(number + '').slice(0, 2)] || 'Unknown';
 		};
 
 		return pub;