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add_filter('salesking_assign_automatically_agent_id', function($agent_id){

	$zip_code = $_POST['fieldzip'];

	if ($zip_code == 100){
		$agent_id = 123; // assign agent here.
	}
	if ($zip_code == 200){
		$agent_id = 4567; // assign agent here.
	}
	
    return $agent_id;
}, 10, 1);