Add credit card mock data

Author: brh55

final/sql-customers/schema.graphql

@@ -27,6 +27,8 @@ type User @key(fields: "id") {
   The users previous purchases
   """
   orders(filters: OrderFilters): [Order]
+
+  paymentMethods: [PaymentMethod]
 }
 
 """
@@ -62,3 +64,8 @@ type ProductVariant @key(fields: "id", resolvable: false) {
   id: ID!
   price: Float! @external
 }
+
+type PaymentMethod {
+  id: ID!
+  cardNumber: String!
+}

final/sql-customers/src/resolvers/index.js

@@ -26,6 +26,26 @@ const resolvers = {
         return orders.map(orderId => ({ id: orderId }));
       }
       return [];
+    },
+    paymentMethods: (root) => {
+      const mockCreditCardNumbers = [
+        '4111111111111111',
+        '346823285239073',
+        '370750517718351',
+        '4556229836495866',
+        '5019717010103742',
+        '4111-1111-1111-1111',
+        '5610591081018250',
+        '30569309025904',
+        '6011111111111117'
+      ];
+
+      return mockCreditCardNumbers.map((cardNumber, index) => {
+        return {
+          id: index,
+          cardNumber: cardNumber
+        };
+      });
     }
   },
   Cart: {