Send custom field metadata to Flodesk using Hubbub Save This

hubbub-save-this-flodesk-metadata.php

<?php
/**
Add subscriber metadata to Flodesk using Hubbub Save This
https://morehubbub.com/
https://morehubbub.com/docs/save-this-actions-and-filters/

Important: in Flodesk, custom_fields keys need to
match real Flodesk custom field keys. If your fields are
not keyed exactly post_id, post_title, and post_url,
replace those array keys with the keys from
your Flodesk account.

https://help.flodesk.com/en/articles/4748737
**/

add_filter(
	'hubbub_save_this_filter_subscriber_data',
	function( $subscriber_data, $post_id, $is_shortcode ) {
		// Only modify the Flodesk payload.
		if ( ! array_key_exists( 'segment', $subscriber_data ) ) {
			return $subscriber_data;
		}

		$post_url = get_permalink( $post_id );

		$subscriber_data['custom_fields'] = array_merge(
			isset( $subscriber_data['custom_fields'] ) && is_array( $subscriber_data['custom_fields'] )
				? $subscriber_data['custom_fields']
				: array(),
			array(
				'post_id'    => (string) $post_id,
				'post_title' => wp_strip_all_tags( get_the_title( $post_id ) ),
				'post_url'   => $post_url ? esc_url_raw( $post_url ) : '',
			)
		);

		return $subscriber_data;
	},
	10,
	3
);