Stamps - - Alter create shipment request

functions.php

add_filter('wf_stamps_request','filter_stamps_request',10,2);

function filter_stamps_request($request,	$order){
	
	if(isset($request['To'])){
		if(isset($request['To']['ZIPCode'])){
			// ignore values after '-'
			$request['To']['ZIPCode']	=	current(explode('-',$request['To']['ZIPCode'])); 
		}
	}
	if(isset($request['Rate'])){
		if(isset($request['Rate']['ToZIPCode'])){
			// ignore values after '-'
			$request['Rate']['ToZIPCode']	=	current(explode('-',$request['Rate']['ToZIPCode'])); 
		}
	}
	return $request;		
}