Price adjustment for a certain state and service.

functions.php

add_filter('wf_ups_rate', 'wf_rate_adjustment', 10, 1);
function wf_rate_adjustment($rate_xml_object){
	$states_requires_price_adjustment = array('CA'); //add state code here
	$service_code_requires_price_adjustment = array('01'=>0.1, '02'=>0.5, '03'=>0.12); //add service code with adjustment value.
	
	$shipping_state = WC()->customer->shipping_state;
	if(!empty($shipping_state) && in_array($shipping_state, $states_requires_price_adjustment) ){
		$code = (string)$rate_xml_object->RatedShipment->Service->Code;
		
		if( array_key_exists($code, $service_code_requires_price_adjustment)  ){
			if ( isset( $rate_xml_object->RatedShipment->NegotiatedRates->NetSummaryCharges->GrandTotal->MonetaryValue ) ){
				
				$rate_cost = (float) $rate_xml_object->RatedShipment->NegotiatedRates->NetSummaryCharges->GrandTotal->MonetaryValue;
				$rate_cost = $rate_cost * $service_code_requires_price_adjustment[ $code ];
				$rate_xml_object->RatedShipment->NegotiatedRates->NetSummaryCharges->GrandTotal->MonetaryValue = $rate_cost;
			}
			else{
				$rate_cost = (float) $rate_xml_object->RatedShipment->TotalCharges->MonetaryValue;

				$rate_cost = $rate_cost * $service_code_requires_price_adjustment[ $code ];

				$rate_xml_object->RatedShipment->TotalCharges->MonetaryValue = $rate_cost;
			}
		}
	}

	return $rate_xml_object;
}