Add support for custom fields in billing invoices

Customers (especially in Europe) need the ability to add Tax IDs, VAT IDs, and other custom fields to their invoices.

Fixes #106

util/invoice.py

@@ -25,6 +25,8 @@ def renderInvoiceToPdf(invoice, user):
 
 def renderInvoiceToHtml(invoice, user):
   """ Renders a nice HTML display for the given invoice. """
+  from endpoints.api.billing import get_invoice_fields
+
   def get_price(price):
     if not price:
       return '$0'
@@ -44,7 +46,8 @@ def renderInvoiceToHtml(invoice, user):
     'invoice': invoice,
     'invoice_date': format_date(invoice.date),
     'getPrice': get_price,
-    'getRange': get_range
+    'getRange': get_range,
+    'custom_fields': get_invoice_fields(user)[0],
   }
 
   template = env.get_template('invoice.tmpl')

util/invoice.tmpl

@@ -19,6 +19,12 @@
          <table>
            <tr><td>Date:</td><td>{{ invoice_date }}</td></tr>
            <tr><td>Invoice #:</td><td style="font-size: 10px">{{ invoice.id }}</td></tr>
+           {% for custom_field in custom_fields %}
+           <tr>
+             <td>*{{ custom_field['title'] }}:</td>
+             <td style="font-size: 10px">{{ custom_field['value'] }}</td>
+           </tr>
+           {% endfor %}
          </table>
        </td>
      </tr>
@@ -38,8 +44,8 @@
          <td style="padding: 4px; min-width: 150px;">{{ getPrice(line.amount) }}</td>
        </tr>
 {%- endfor -%}
-       
-       
+
+
        <tr>
          <td></td>
          <td valign="right">
@@ -54,7 +60,7 @@
        </tr>
      </tbody>
    </table>
-   
+
    <div style="margin: 6px; padding: 6px; width: 100%; max-width: 640px; border-top: 2px solid #eee; text-align: center; font-size: 14px; -webkit-text-adjust: none; font-weight: bold;">
      We thank you for your continued business!
    </div>