Filters:

1. bt_sst_product_page_delivery_checker_label_text
2. bt_sync_shimpent_track_pincode_checker_shipping_to_text

<?php

function bt_sst_product_page_delivery_checker_label_text($content) {
					$content .= '

This is a message added by the shortcode filter.
';
					return $content;
				}
				add_filter('bt_sst_product_page_delivery_checker_label_text', 'bt_sst_product_page_delivery_checker_label_text');
				
function bt_sync_shimpent_track_pincode_checker_shipping_to_text($content) {
					$content = 'Select a delivery location to see product availability and delivery options';
					return $content;
				}
				add_filter('bt_sync_shimpent_track_pincode_checker_shipping_to_text', 'bt_sync_shimpent_track_pincode_checker_shipping_to_text');