+1 per-country VAT number, for at_AT

readme.md

@@ -665,6 +665,15 @@ Fugiat non in itaque sunt nobis totam. Sed nesciunt est deleniti cumque alias. R
 
 ## Language specific formatters
 
+### `Faker\Provider\at_AT\Payment`
+```php
+<?php
+
+echo $faker->vat;           // "AT U12345678" - Austrian Value Added Tax number
+echo $faker->vat(false);    // "ATU12345678" - unspaced Austrian Value Added Tax number
+
+```
+
 ### `Faker\Provider\cs_CZ\Address`
 ```php
 <?php

src/Faker/Generator.php

@@ -34,6 +34,7 @@
  * @property string $creditCardDetails
  * @property string $bankAccountNumber
  * @property string $swiftBicNumber
+ * @property string $vat
  *
  * @property string $word
  * @method string words()

src/Faker/Provider/at_AT/Payment.php

@@ -0,0 +1,31 @@
+<?php
+
+namespace Faker\Provider\at_AT;
+
+/**
+ * Class Payment
+ *
+ * @package Faker\Provider\at_AT
+ */
+class Payment extends \Faker\Provider\Payment
+{
+    /**
+     * Value Added Tax (VAT)
+     *
+     * @example 'ATU12345678', ('spaced') 'AT U12345678'
+     *
+     * @see http://ec.europa.eu/taxation_customs/vies/faq.html?locale=en#item_11
+     * @see http://www.iecomputersystems.com/ordering/eu_vat_numbers.htm
+     * @see http://en.wikipedia.org/wiki/VAT_identification_number
+     *
+     * @param bool $spacedNationalPrefix
+     *
+     * @return string VAT Number
+     */
+    public static function vat($spacedNationalPrefix = true)
+    {
+        $prefix = ($spacedNationalPrefix) ? "AT U" : "ATU";
+
+        return sprintf("%s%d", $prefix, self::randomNumber(8, true));
+    }
+}

test/Faker/Provider/at_AT/PaymentTest.php

@@ -0,0 +1,30 @@
+<?php
+
+namespace Faker\Test\Provider\at_AT;
+
+use Faker\Generator;
+use Faker\Provider\at_AT\Payment;
+
+class PaymentTest extends \PHPUnit_Framework_TestCase
+{
+
+    /**
+     * @var Generator
+     */
+    private $faker;
+
+    public function setUp()
+    {
+        $faker = new Generator();
+        $faker->addProvider(new Payment($faker));
+        $this->faker = $faker;
+    }
+
+    public function testVatIsValid()
+    {
+        $vat = $this->faker->vat();
+        $unspacedVat = $this->faker->vat(false);
+        $this->assertRegExp('/^(AT U\d{8})$/', $vat);
+        $this->assertRegExp('/^(ATU\d{8})$/', $unspacedVat);
+    }
+}