[WIP] Invite user form now submits data to api.

app/notify_client/invite_api_client.py

@@ -0,0 +1,23 @@
+
+from notifications_python_client.base import BaseAPIClient
+
+
+class InviteApiClient(BaseAPIClient):
+    def __init__(self, base_url=None, client_id=None, secret=None):
+        super(self.__class__, self).__init__(base_url=base_url or 'base_url',
+                                             client_id=client_id or 'client_id',
+                                             secret=secret or 'secret')
+
+    def init_app(self, app):
+        self.base_url = app.config['API_HOST_NAME']
+        self.client_id = app.config['ADMIN_CLIENT_USER_NAME']
+        self.secret = app.config['ADMIN_CLIENT_SECRET']
+
+    def create_invite(self, invite_from_id, service_id, email_address):
+        data = {
+            'service': str(service_id),
+            'email_address': email_address,
+            'from_user': invite_from_id
+        }
+        resp = self.post(url='/service/{}/invite'.format(service_id), data=data)
+        return resp['data']