$key = \str_replace( $prefix, '', $meta_data_object->key );
					if ( $all || $this->is_field( $key ) ) {
						$meta_data[ $key ] = $meta_data_object->value;
					}
				}
			}
		}

		$missing_fields = array_diff( array_keys( $this->get_fields_for_group( $group ) ), array_keys( $meta_data ) );

		foreach ( $missing_fields as $missing_field ) {
				/**
				 * Allow providing a default value for additional fields if no value is already set.
				 *
				 * @param null $value The default value for the filter, always null.
				 * @param string $group The group of this key (shipping|billing|other).
				 * @param WC_Data $wc_object The object to get the field value for.
				 *
				 * @since 8.9.0
				 */
				$value = apply_filters( "woocommerce_get_default_value_for_{$missing_field}", null, $group, $wc_object );

			if ( isset( $value ) ) {
				$meta_data[ $missing_field ] = $value;
			}
		}

		return $meta_data;
	}

	/**
	 * Copies additional fields from an order to a customer.
	 *
	 * @param WC_Order    $order The order to sync the fields for.
	 * @param WC_Customer $customer The customer to sync the fields for.
	 */
	public function sync_customer_additional_fields_with_order( WC_Order $order, WC_Customer $customer ) {
		foreach ( $this->groups as $group ) {
			$order_additional_fields = $this->get_all_fields_from_object( $order, $group, true );

			// Sync customer additional fields with order additional fields.
			foreach ( $order_additional_fields as $key => $value ) {
				if ( $this->is_customer_field( $key ) ) {
					$this->persist_field_for_customer( $key, $value, $customer, $group );
				}
			}
		}
	}

	/**
	 * Copies additional fields from a customer to an order.
	 *
	 * @param WC_Order    $order The order to sync the fields for.
	 * @param WC_Customer $customer The customer to sync the fields for.
	 */
	public function sync_order_additional_fields_with_customer( WC_Order $order, WC_Customer $customer ) {
		foreach ( $this->groups as $group ) {
			$customer_additional_fields = $this->get_all_fields_from_object( $customer, $group, true );

			// Sync order additional fields with customer additional fields.
			foreach ( $customer_additional_fields as $key => $value ) {
				if ( $this->is_field( $key ) ) {
					$this->persist_field_for_order( $key, $value, $order, $group, false );
				}
			}
		}
	}

	/**
	 * From a set of fields, returns only the ones for a given location.
	 *
	 * @param array  $fields The fields to filter.
	 * @param string $location The location to validate the field for (address|contact|order).
	 * @return array The filtered fields.
	 */
	public function filter_fields_for_location( array $fields, string $location ) {
		$location = $this->prepare_location_name( $location );

		return array_filter(
			$fields,
			function ( $key ) use ( $location ) {
				return $this->get_field_location( $key ) === $location;
			},
			ARRAY_FILTER_USE_KEY
		);
	}

	/**
	 * Filter fields for order confirmation.
	 *
	 * @param array $fields  The fields to filter.
	 * @param array $context Additional context for the filter.
	 * @return array The filtered fields.
	 */
	public function filter_fields_for_order_confirmation( $fields, $context = array() ) {
		return array_filter(
			$fields,
			function ( $field ) use ( $fields, $context ) {
				/**
				 * Filter fields for order confirmation (thank you page, email).
				 *
				 * Used in methods:
				 * WC_Email::additional_checkout_fields
				 * WC_Email::additional_address_fields
				 * CheckoutFieldsFrontend::render_order_other_fields
				 * CheckoutFieldsFrontend::render_order_address_fields
				 * AdditionalFields::render_content
				 * BillingAddress::render_content
				 * ShippingAddress::render_content
				 *
				 * @param bool           $show_field Whether the field should be shown.
				 * @param array          $field      Field data.
				 * @param array          $fields     All fields for better context when field should be shown or hidden based on other fields values.
				 * @param array          $context    Additional context for the filter. Data depends in which method filter_fields_for_order_confirmation is called.
				 * @param CheckoutFields $instance   The CheckoutFields instance.
				 * @since 10.1.0
				 */
				return apply_filters( 'woocommerce_filter_fields_for_order_confirmation', ! empty( $field['show_in_order_confirmation'] ), $field, $fields, $context, $this );
			}
		);
	}

	/**
	 * Get additional fields for an order.
	 *
	 * @param WC_Order $order Order object.
	 * @param string   $location The location to get fields for (address|contact|order).
	 * @param string   $group The group to get the field value for (shipping|billing|other).
	 * @param string   $context The context to get the field value for (edit|view).
	 * @return array An array of fields definitions as well as their values formatted for display.
	 */
	public function get_order_additional_fields_with_values( WC_Order $order, string $location, string $group = 'other', string $context = 'edit' ) {

		// Because the Additional Checkout Fields API only applies to orders created with Store API, we should not
		// return any values unless it was created using Store API. This is mainly to prevent "empty" checkbox values
		// from being shown on the order confirmation page for orders placed using the shortcode. It's rare that this
		// will happen but not impossible.
		if ( 'store-api' !== $order->get_created_via() ) {
			return [];
		}

		$location           = $this->prepare_location_name( $location );
		$group              = $this->prepare_group_name( $group );
		$fields             = $this->get_fields_for_location( $location );
		$fields_with_values = [];

		foreach ( $fields as $field_key => $field ) {
			$value = $this->get_field_from_object( $field_key, $order, $group );

			if ( '' === $value || null === $value ) {
				continue;
			}

			if ( 'view' === $context ) {
				$value = $this->format_additional_field_value( $value, $field );
			}

			$field['value']                   = $value;
			$fields_with_values[ $field_key ] = $field;
		}

		return $fields_with_values;
	}

	/**
	 * Formats a raw field value for display based on its type definition.
	 *
	 * @param string $value Value to format.
	 * @param array  $field Additional field definition.
	 * @return string
	 */
	public function format_additional_field_value( $value, $field ) {
		if ( 'checkbox' === $field['type'] ) {
			$value = $value ? __( 'Yes', 'woocommerce' ) : __( 'No', 'woocommerce' );
		}

		if ( 'select' === $field['type'] ) {
			$options = array_column( $field['options'], 'label', 'value' );
			$value   = isset( $options[ $value ] ) ? $options[ $value ] : $value;
		}

		return $value;
	}

	/**
	 * Prepares a group name for use.
	 *
	 * @param string $group The group name to prepare.
	 * @return string The prepared group name.
	 */
	private function prepare_group_name( $group ) {
		if ( ! in_array( $group, $this->groups, true ) ) {
			$group = 'other';
		}
		return $group;
	}

	/**
	 * Prepares a location name for use.
	 *
	 * @param string $location The location name to prepare.
	 * @return string The prepared location name.
	 */
	private function prepare_location_name( $location ) {
		if ( 'additional' === $location ) {
			$location = 'order';
		}
		return $location;
	}

	/**
	 * Returns a group meta prefix based on its name.
	 *
	 * @param string $group_name The group name (billing|shipping|other).
	 * @return string The group meta prefix.
	 */
	public static function get_group_key( $group_name ) {
		if ( 'additional' === $group_name ) {
			wc_deprecated_argument( 'group_name', '8.9.0', 'The "additional" group is deprecated. Use "other" instead.' );
			$group_name = 'other';
		}
		if ( 'billing' === $group_name ) {
			return self::BILLING_FIELDS_PREFIX;
		}
		if ( 'shipping' === $group_name ) {
			return self::SHIPPING_FIELDS_PREFIX;
		}
		return self::OTHER_FIELDS_PREFIX;
	}

	/**
	 * Returns a group name based on passed group key.
	 *
	 * @param string $group_key The group name (_wc_billing|_wc_shipping|_wc_other).
	 * @return string The group meta prefix.
	 */
	public static function get_group_name( $group_key ) {
		if ( '_wc_additional' === $group_key ) {
			wc_deprecated_argument( 'group_key', '8.9.0', 'The "_wc_additional" group key is deprecated. Use "_wc_other" instead.' );
			$group_key = '_wc_other';
		}
		if ( 0 === \strpos( self::BILLING_FIELDS_PREFIX, $group_key ) ) {
			return 'billing';
		}
		if ( 0 === \strpos( self::SHIPPING_FIELDS_PREFIX, $group_key ) ) {
			return 'shipping';
		}
		return 'other';
	}
}