Remove '-' from Canadian zip code from WooCommerce CanadaPost plugin https://www.xadapter.com/product/woocommerce-canada-post-shipping-plugin-with-print-label/

functions.php

add_filter('xa_canadapost_rate_request', 'sanitize_postal_code_for_rate_req', 10, 2);
function sanitize_postal_code_for_rate_req($xmlRequest, $package){
    $xml_obj = new SimpleXMLElement($xmlRequest);
    if( isset($xml_obj->{'destination'}->{'domestic'}->{'postal-code'}) ){
        $xml_obj->{'destination'}->{'domestic'}->{'postal-code'} = str_replace("-","",$xml_obj->{'destination'}->{'domestic'}->{'postal-code'} );
    }

    $doc = new DOMDocument();
    $doc->formatOutput = TRUE;
    $doc->loadXML($xml_obj->asXML());
    return $doc->saveXML();
}
add_filter('wf_canadapost_request', 'sanitize_postal_code_for_label_req', 10, 2);
function sanitize_postal_code_for_label_req($xmlRequest, $order_id){
    $xml_obj = new SimpleXMLElement($xmlRequest);
    if($xml_obj->{'delivery-spec'}->{'destination'}->{'address-details'}->{'country-code'} == 'CA'){
        $xml_obj->{'delivery-spec'}->{'destination'}->{'address-details'}->{'postal-zip-code'} = str_replace('-', "", $xml_obj->{'delivery-spec'}->{'destination'}->{'address-details'}->{'postal-zip-code'});

    }
    $doc = new DOMDocument();
    $doc->formatOutput = TRUE;
    $doc->loadXML($xml_obj->asXML());
    return $doc->saveXML();
}