Actions/Filters for Developers

$post_vars = array(
 	'post_type'     => 'sfwd-courses',
 	'meta_key'      => 'learndash_group_enrolled_' . $group_id,
 	'post_per_page' => - 1,
 	'numberposts'   => - 1
);
$post_vars = apply_filters( 'ulgm_group_courses_list_get_posts_vars', $post_vars, $group_id);
$courses = get_posts( $post_vars );
$courses = apply_filters( 'ulgm_group_courses_list_courses', $courses, $post_vars, $group_id);

// API data
$group_data = array(
   'enrolled_user_data'           => self::$ulgm_enrolled_users_data_dt,
   'enrolled_leader_data'         => self::$ulgm_group_leaders_data_dt,
   'check_all'                    => $this->table_checkbox( 'all' ),
   'populate_management_features' => json_encode( self::$populate_management_features ),
);
$group_data = apply_filters('ulgmGroupLeaderData', $group_data );

$(document).trigger('enrolledUsersTableDataTableCreated', {userTableVars: userTableVars, userTable: userTable, ulgmGroupLeaderData:ulgmGroupLeaderData} );
$(document).trigger('enrolledLeaderTableDataTableCreated', {leaderTableVars: leaderTableVars, leaderTable: leaderTable, ulgmGroupLeaderData:ulgmGroupLeaderData} );

do_action( 'ulgm_existing_group_user_added', $user_data, $group_id, $order_id );
$do_not_send_emails = apply_filters( 'ulgm_do_not_send_existing_user_email', $do_not_send_emails, $user_data, $group_id, $order_id );

//returns true or false if group leader allowed to add user
//wp_get_current_user() = (object) of current logged in user details 
//$group_email_data['group_id'] = (int) LD Group ID 
//$user_data = (object) user data, user_email is part of the array and recommended method to verify user v/s group leader
$ulgm_gdpr_compliance = apply_filters( 'ulgm_gdpr_is_group_leader_allowed', true, wp_get_current_user(), (int) $group_email_data['group_id'], $user_data );

do_action( 'ulgm_group_user_invited', $user_data, $group_id, $order_id );
$do_not_send_emails = apply_filters( 'ulgm_do_not_send_new_user_email', $do_not_send_emails, $user_data, $group_id, $order_id );

do_action( 'ulgm_redemption_email_sent', $user_data, $group_id );
$do_not_send_emails = apply_filters( 'ulgm_do_not_send_redemption_email', $do_not_send_emails, $user_data, $group_id );

do_action( 'ulgm_group_leader_added', $user_data, (int) $_POST['group-id'], $order_id );

do_action( 'ulgm_group_leader_removed', $user_id, (int) $group_id );

do_action( 'ulgm_group_user_removed', $user_id, (int) $group_id );

$to      = apply_filters( 'ulgm_redemption_email_to', $user_email, $user_data, $group_id );
$subject = apply_filters( 'ulgm_redemption_email_subject', $redemption_template_subject, $user_data, $group_id );
$body    = apply_filters( 'ulgm_redemption_email_body', $redemption_template_body, $user_data, $group_id );

$to      = apply_filters( 'ulgm_welcome_email_to', $user_email, $user_data, $group_name );
$subject = apply_filters( 'ulgm_welcome_email_subject', $welcome_template_subject, $user_data, $group_name );
$body    = apply_filters( 'ulgm_welcome_email_body', $welcome_template_body

//For emails sent with "Email Users" button
$mail_args['subject'] = apply_filters( 'ld_group_email_users_personalize_subject', $mail_args['subject'], $user_data, $group_email_data );
$mail_args['message'] = apply_filters( 'ld_group_email_users_personalize_message', $mail_args['message'], $user_data, $group_email_data );

Redirect after Create Group

apply_filters( 'uo_redirect_after_group_created', $redirect_url, $group_id );

REST API endpoints

apply_filters( 'ulgm_rest_api_get_user_course_data', $data, $_POST );
apply_filters( 'ulgm_rest_api_get_group_courses', $data, $_POST );
apply_filters( 'ulgm_rest_api_get_essays_data', $essays_table, $_POST );
apply_filters( 'ulgm_rest_api_get_quiz_data', $quiz_table, $_POST );
apply_filters( 'ulgm_rest_api_get_assignments_data', $assignments_table, $_POST );