Try changing the "+=" to just "=" on the two lines in this section around line 361:Does that fix your handling fee duplication issues?Code:if ($order->delivery['country']['id'] == SHIPPING_ORIGIN_COUNTRY || $this->usps_countries == 'US') { // domestic/national $usps_handling_fee += MODULE_SHIPPING_USPS_HANDLING; } else { // international $usps_handling_fee += MODULE_SHIPPING_USPS_HANDLING_INT;
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