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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.

==== 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>
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