Adding Documentation and example for Order Wallet Types

README.md

@@ -54,6 +54,18 @@ style it, take a look at the [docs at developers.apple.com](https://developer.ap
    choose `Export 2 items…`.
 6. Choose a password and export the file to a folder.
 
+### Requesting the Order Certificate
+
+1. Go to the [iOS Provisioning portal](https://developer.apple.com/account/ios/identifier/passTypeId).
+2. Create a new Order Type ID Certificate, and write down the Order Type ID you choose, you'll need it later.
+3. Click the edit button under your newly created Order Type ID and generate a certificate according to the instructions
+   shown on the page. Make sure *not* to choose a name for the Certificate but keep it empty instead.
+4. Download the .cer file and drag it into Keychain Access.
+5. Find the certificate you just imported and click the triangle on the left to reveal the private key.
+6. Select both the certificate and the private key it, then right-click the certificate in Keychain Access and
+   choose `Export 2 items…`.
+6. Choose a password and export the file to a folder.
+
 #### OpenSSL error
 When you get the error 'Could not read certificate file. This might be related to using an OpenSSL version that has deprecated some older hashes. More info here: https://schof.link/2Et6z3m OpenSSL error: error:0308010C:digital envelope routines::unsupported' this is due to osx exporting the .p12 file using an old version of OpenSSL. To fix this issue, use the following commands:
 

src/FinanceOrder.php

@@ -58,6 +58,58 @@ protected function createManifest()
         return json_encode((object)$sha);
     }
 
+    /**
+     * Create the actual .pkpass file.
+     *
+     * @param bool $output Whether to output it directly or return the pass contents as a string.
+     *
+     * @return string
+     * @throws PKPassException
+     */
+    public function create($output = false)
+    {
+        // Prepare payload
+        $manifest = $this->createManifest();
+        $signature = $this->createSignature($manifest);
+
+        // Build ZIP file
+        $zip = $this->createZip($manifest, $signature);
+
+        // Return pass
+        if (!$output) {
+            return $zip;
+        }
+
+        // Output pass
+        header('Content-Description: File Transfer');
+        header('Content-Type: ' . self::MIME_TYPE);
+        header('Content-Disposition: attachment; filename="' . $this->getName() . '"');
+        header('Content-Transfer-Encoding: binary');
+        header('Connection: Keep-Alive');
+        header('Expires: 0');
+        header('Cache-Control: must-revalidate, post-check=0, pre-check=0');
+        header('Last-Modified: ' . gmdate('D, d M Y H:i:s T'));
+        header('Pragma: public');
+        echo $zip;
+
+        return '';
+    }
+
+    /**
+     * Get filename.
+     *
+     * @return string
+     */
+    public function getName()
+    {
+        $name = $this->name ?: self::FILE_TYPE;
+        if (!strstr($name, '.')) {
+            $name .= '.' . self::FILE_EXT;
+        }
+
+        return $name;
+    }
+
     /**
      * Creates .pkpass zip archive.
      *