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For orders over $200, we force domestic customers to use UPS as opposed to USPS. Here's how to set an arbitrary limit on the usps shipping module.

{{:tutorials:zencartmods:limit.png}}

==== includes/languages/english/modules/shipping/usps.php ====

add these lines 
<code>
define('MODULE_SHIPPING_USPS_LIMIT_ERROR', 'For packages over $200 we require shipment via UPS');
define('MODULE_SHIPPING_USPS_LIMIT', 200);
</code>


Change 200 to whatever you want the limit to be!

==== includes/modules/shipping/usps.xml ====

Find line 188
<code php>
    if (is_array($uspsQuote)) {
</code>

and replace with 

<code php>
if (is_array($uspsQuote) && $_SESSION['cart']->total < MODULE_SHIPPING_USPS_LIMIT) {
</code>

Find line 281

<code php>
elseif ($uspsQuote == -1) {
      $this->quotes = array('module' => $this->title,
                            'error' => MODULE_SHIPPING_USPS_TEXT_SERVER_ERROR . (MODULE_SHIPPING_USPS_SERVER=='test' ? MODULE_SHIPPING_USPS_TEXT_TEST_MODE_NOTICE : ''));
    } 
</code>
and replace with 
<code php>
elseif ($uspsQuote == -1) {
      $this->quotes = array('module' => $this->title,
                            'error' => MODULE_SHIPPING_USPS_TEXT_SERVER_ERROR . (MODULE_SHIPPING_USPS_SERVER=='test' ? MODULE_SHIPPING_USPS_TEXT_TEST_MODE_NOTICE : ''));
    } elseif ($_SESSION['cart']->total > MODULE_SHIPPING_USPS_LIMIT) {
      $this->quotes = array('module' => $this->title,
                            'error' => MODULE_SHIPPING_USPS_LIMIT_ERROR);
    }
</code>


=== Notes ===

Make sure that you have other shipping options enabled! Don't disable USPS without any good alternatives.

Also, UPS can't ship to PO Boxes. If shipping expensive things to PO Boxes is important for your business, don't do this mod!
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