Add Domain Purchase API Call

oauth3.domains.js

@@ -18,6 +18,20 @@ OAUTH3.api['domains.checkAvailability'] = function (providerUri, opts) {
   });
 };
 
+OAUTH3.api['domains.purchase'] = function (providerUri, opts) {
+  var session = opts.session;
+
+  return OAUTH3.request({
+    method: 'POST'
+  , url: OAUTH3.url.normalize(providerUri)
+      + '/api/com.daplie.domains/accounts/' + session.token.sub + '/registrations'
+  , session: session
+  , data: opts.data
+  }).then(function (res) {
+    return res;
+  });
+};
+
 OAUTH3.api['domains.list'] = function (providerUri, opts) {
   var session = opts.session;