maaykS

add_filter( 'wcml_client_currency', 'modify_client_currency', 10, 1 );
   
function modify_client_currency( $current_currency ) {
    if( !is_admin() ){
        global $woocommerce;
   
        $currency = isset( $_GET['currency'] ) ? esc_attr( $_GET['currency'] ) : $current_currency;
        $currency = strtoupper( $currency );
   
        $woocommerce->session->set('client_currency', $currency);
   
        return $currency;
      }
}