[DP-468] Retrieve Invoice endpoint (#24)

README.md

@@ -138,6 +138,8 @@ ChartMogul.Plan.destroy(config, uuid)
 ```js
 ChartMogul.Invoice.create(config, customerUuid, data)
 ChartMogul.Invoice.all(config, customerUuid, query)
+ChartMogul.Invoice.all(config, query)
+ChartMogul.Invoice.retrieve(config, invoiceUuid)
 ```
 
 #### [Transactions](https://dev.chartmogul.com/docs/transactions)

lib/chartmogul/invoice.js

@@ -11,6 +11,7 @@ class Invoice extends Resource {
 
 // @Override
 Invoice.all_customer = Invoice.all;
+
 Invoice.all_any = Resource._method('GET', '/v1/invoices');
 
 Invoice.all = function (config, params, cb) {
@@ -23,4 +24,6 @@ Invoice.all = function (config, params, cb) {
 
 Invoice.destroy = Resource._method('DELETE', '/v1/invoices{/uuid}');
 
+Invoice.retrieve = Resource._method('GET', '/v1/invoices{/uuid}');
+
 module.exports = Invoice;

package.json

@@ -1,6 +1,6 @@
 {
   "name": "chartmogul-node",
-  "version": "1.0.4",
+  "version": "1.0.5",
   "description": "Official Chartmogul API Node.js Client",
   "main": "lib/chartmogul.js",
   "scripts": {

test/chartmogul/invoice.js

@@ -227,4 +227,16 @@ describe('Invoices', () => {
       expect(res).to.be.deep.equal({});
     });
   });
+
+  it('should retrieve an invoice', () => {
+    var payload = {external_id: 'some_invoice_id'};
+    nock(config.API_BASE)
+    .get('/v1/invoices/inv_cff3a63c-3915-435e-a675-85a8a8ef4454')
+    .reply(200, payload);
+
+    return Invoice.retrieve(config, 'inv_cff3a63c-3915-435e-a675-85a8a8ef4454')
+    .then(res => {
+      expect(res).to.be.deep.equal(payload);
+    });
+  });
 });