Add account-related examples for balance and configuration

Author: lornajane

.env-example

@@ -8,3 +8,4 @@ RECIPIENT_NUMBER
 TO_NUMBER=
 NEXMO_SECRET_ID=
 INSIGHT_NUMBER=
+SMS_CALLBACK_URL=

account/account-balance.php

@@ -0,0 +1,9 @@
+<?php
+require_once __DIR__ . '/../config.php';
+require_once __DIR__ . '/../vendor/autoload.php';
+
+$basic  = new \Nexmo\Client\Credentials\Basic(NEXMO_API_KEY, NEXMO_API_SECRET);
+$client = new \Nexmo\Client($basic);
+
+$response = $client->account()->getBalance();
+echo round($response->data['balance'], 2) . " EUR\n";

account/configure-account.php

@@ -0,0 +1,11 @@
+<?php
+require_once __DIR__ . '/../config.php';
+require_once __DIR__ . '/../vendor/autoload.php';
+
+$basic  = new \Nexmo\Client\Credentials\Basic(NEXMO_API_KEY, NEXMO_API_SECRET);
+$client = new \Nexmo\Client($basic);
+
+$response = $client->account()->updateConfig([
+    "sms_callback_url" => SMS_CALLBACK_URL
+]);
+print_r($response->data);