Propagate product category custom Joinchat settings to products with that category and propagate to Cart and Checkout Pages if contains that product.

joinchat-propagate-product-category-settings.php

<?php

/**
 * Joinchat use Product category settings on product page
 *
 * Use custom Joinchat settings from the first category of the product
 * with custom Joinchat settings.
 *
 * @param  array $settings
 * @return array
 */
function joinchat_use_category_settings_on_product( $settings ) {

	if ( is_product() ) {
		$terms = get_the_terms( get_the_ID(), 'product_cat' );

		foreach ( $terms as $term ) {
			$term_settings = get_term_meta( $term->term_id, '_joinchat', true );
			if ( ! empty( $term_settings ) ) {
				break;
			}
		}
	}

	return ( ! empty( $term_settings ) ) ? array_merge( $settings, $term_settings ) : $settings;
}

add_filter( 'joinchat_get_settings_site', 'joinchat_use_category_settings_on_product', 12 );


/**
 * Joinchat use Product category settings on Cart & Checkout pages
 *
 * Use custom Joinchat settings from the first category of the first product
 * in cart/order with custom Joinchat settings.
 *
 * @param  array $settings
 * @return array
 */
function joinchat_use_category_settings_on_cart_or_checkout( $settings ) {

	if ( is_cart() || ( is_checkout() && ! is_wc_endpoint_url() ) ) {
		// Get terms from products on cart.
		foreach ( WC()->cart->get_cart() as $cart_item ) {
			$terms = get_the_terms( $cart_item['product_id'], 'product_cat' );

			foreach ( $terms as $term ) {
				$term_settings = get_term_meta( $term->term_id, '_joinchat', true );
				if ( ! empty( $term_settings ) ) {
					break 2;
				}
			}
		}
	} elseif ( is_wc_endpoint_url( 'order-received' ) && isset( $_GET['key'] ) ) {
		// Get terms from products on order.
		$order = false;

		$order_id  = apply_filters( 'woocommerce_thankyou_order_id', absint( get_query_var( 'order-received' ) ) );
		$order_key = apply_filters( 'woocommerce_thankyou_order_key', empty( $_GET['key'] ) ? '' : wc_clean( wp_unslash( $_GET['key'] ) ) ); // WPCS: input var ok, CSRF ok.

		if ( $order_id > 0 ) {
			$order = wc_get_order( $order_id );

			if ( ! $order || ! hash_equals( $order->get_order_key(), $order_key ) ) {
				$order = false;
			}
		}

		if ( ! empty( $order ) ) {
			foreach ( $order->get_items() as $item ) {
				if ( $item->is_type( 'line_item' ) ) {
					$product = $item->get_product();
					$terms   = get_the_terms( $product->get_id(), 'product_cat' );

					foreach ( $terms as $term ) {
						$term_settings = get_term_meta( $term->term_id, '_joinchat', true );
						if ( ! empty( $term_settings ) ) {
							break 2;
						}
					}
				}
			}
		}
	}

	return ( ! empty( $term_settings ) ) ? array_merge( $settings, $term_settings ) : $settings;
}

add_filter( 'joinchat_get_settings_site', 'joinchat_use_category_settings_on_cart_or_checkout', 12 );