Custom action hook for custom conversion tracking in Canvas in OptinMonster.

custom-conversion-tracking.js

jQuery(document).ready(function($){
	$(document).on('click', '.om-custom-html-form a button', function(e){
		// Prepare variables.
		var $this = $(this),
			optin = $this.closest('.optin-monster-overlay').attr('id').replace('om-', '').replace('-', '_');
		if ( ! window[optin] ) {
			return;
		}

		// Send ajax request to track the optin.
		var data = {
			optin_monster_ajax_action: 'track_optinmonster_custom',
			id: window[optin].getProp('id')
		};
		$.post(window[optin].getProp('ajax'), data, function(res){}, 'json');
	});
});

custom-conversion-tracking.php

add_action( 'optin_monster_ajax_action', 'tgm_om_custom_tracker', 10, 2 );
function tgm_om_custom_tracker( $action, $data ) {

	// If not our action, do nothing.
	if ( 'track_optinmonster_custom' !== $action ) {
		return;
	}

	// If our ID is not passed, do nothing.
	if ( empty( $data['id'] ) ) {
		return;
	}

	// Load our interfaces and track the conversion.
	if ( ! class_exists( 'Optin_Monster_Track_Datastore' ) ) {
		require plugin_dir_path( Optin_Monster::get_instance()->file ) . 'includes/global/track-datastore.php';
	}
	$track = new Optin_Monster_Track_Datastore( absint( $data['id'] ) );
	$track->save( 'conversion' );

}