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All booking form styles for input elements located in the ../wp-content/plugins/{Booking Calendar Folder}/css/client.css file.
You can reconfigure them there.
Kind Regards.

Hello.
In the Booking Calendar Business Small or higher versions you can activate this option “ Show booking details in payment form” at the Booking > Settings > Payment page.
To show the booking summary before payment buttons.
Kind Regards.

Hello.
Shortcodes, like this [calendar] you can add ONLY to the booking form at the Booking > Settings > Form page.

This function do_shortcode() can be applied only to the shortcodes that you insert into the content of the post or page. Here is list of such shortcodes: https://wpbookingcalendar.com/faq/#shortcodes

Hello.
It’s possible to have the different times selection for the different days in the Booking Calendar Business Medium or higher versions.
Please check more here
https://wpbookingcalendar.com/overview/#times-week-days

You can check more info about this configuration at this page
https://wpbookingcalendar.com/help/different-time-slots-selections-for-different-days/
Kind Regards.

Hello.
We have developed new plugin – “Email Reminders”, which have similar functionality and native integration with latest versions of Booking Calendar plugin.

Please check more here
https://oplugins.com/plugins/email-reminders/

You can try it. But currently we do not provide support or help with configuration with this plugin. Because of too much work and support with Booking Calendar plugin.
Thank you for understanding.

Hello.

Please check about the configuration of export .ics feeds in this FAQ instruction here https://wpbookingcalendar.com/faq/export-ics-feeds/
Booking Calendar is generate .ics feed with bookings in real time. But how often some service (like airbnb, or booking.com ) access this .ics feed to import the bookings from Booking Calendar into own system, does not depend from Booking Calendar. So in other words, Booking Calendar does not force to generate import process by third party service, when some booking is created. You need to check with support of this service (like airbnb or booking.com), about how often they can access the .ics feed tor making import.

Hello.
Please send request to support @ wpbookingcalendar.com
I will send to you that file, after that.
Thank you.

Hello.
OK here is fix that you need todo.
It’s will be available with next update of Booking Calendar, as well.

Please open this file ../wp-content/plugins/booking/core/wpbc-include.php

( you can check how to edit files in WordPress menu in this article https://wpbookingcalendar.com/faq/how-edit-file-in-wp-menu/ )

then find this code:

//FixIn: 8.8.2.5
$locale = wpbc_get_booking_locale();
if ( ! empty( $locale ) ) {
	$locale_lang    = strtolower( substr( $locale, 0, 2 ) );
	$locale_country = strtolower( substr( $locale, 3 ) );

	if ( ( $locale_lang !== 'en' ) && ( wpbc_is_file_exist( '/languages/wpdev-country-list-' . $locale . '.php' ) ) ) {
		require_once WPBC_PLUGIN_DIR . '/languages/wpdev-country-list-' . $locale . '.php';
	} else {
		require_once WPBC_PLUGIN_DIR . '/languages/wpdev-country-list.php';             // Load Country list
	}
} else {
	require_once WPBC_PLUGIN_DIR . '/languages/wpdev-country-list.php';                     // Load Country list
}

and replace it to this code:

//FixIn: 8.8.3.8
add_action( 'plugins_loaded', 'wpbc_late_load_country_list', 100, 1 );
/**
 * Load country list after locale defined by some other translation  plugin.
 */
function wpbc_late_load_country_list() {

	//FixIn: 8.8.2.5
	$locale = wpbc_get_booking_locale();
	if ( ! empty( $locale ) ) {
		$locale_lang    = strtolower( substr( $locale, 0, 2 ) );
		$locale_country = strtolower( substr( $locale, 3 ) );

		if ( ( $locale_lang !== 'en' ) && ( wpbc_is_file_exist( '/languages/wpdev-country-list-' . $locale . '.php' ) ) ) {
			require_once WPBC_PLUGIN_DIR . '/languages/wpdev-country-list-' . $locale . '.php';
		} else {
			require_once WPBC_PLUGIN_DIR . '/languages/wpdev-country-list.php';
		}
	} else {
		require_once WPBC_PLUGIN_DIR . '/languages/wpdev-country-list.php';
	}
}

P.S. In paid versions, it’s require additional fix in personal.php file, but it’s seems that you are using the Booking Calendar Free version.
Kind Regards.