MemberPress + LearnDash: Enroll Members in Courses

if ( ! class_exists( 'MeprUser' ) || ! function_exists( 'ld_update_course_access' ) ) {
    return;
}

// Membership ID => LearnDash course IDs.
$wpide_mepr_ld_courses = array(
    123 => array( 1001, 1002 ),
);

add_action( 'mepr-event-transaction-completed', function ( $event ) use ( $wpide_mepr_ld_courses ) {
    $txn     = $event->get_data();
    $user_id = (int) $txn->user_id;
    $granted = array_map( 'intval', (array) get_user_meta( $user_id, 'wpide_mepr_ld_granted', true ) );

    foreach ( $wpide_mepr_ld_courses[ (int) $txn->product_id ] ?? array() as $course_id ) {
        if ( ! sfwd_lms_has_access( $course_id, $user_id ) ) {
            ld_update_course_access( $user_id, (int) $course_id );
            $granted[] = (int) $course_id;
        }
    }

    update_user_meta( $user_id, 'wpide_mepr_ld_granted', array_values( array_unique( $granted ) ) );
} );

add_action( 'mepr-event-transaction-expired', function ( $event ) use ( $wpide_mepr_ld_courses ) {
    $txn     = $event->get_data();
    $user_id = (int) $txn->user_id;
    $member  = new MeprUser( $user_id );

    if ( $member->is_already_subscribed_to( (int) $txn->product_id ) ) {
        return;
    }

    // Courses still covered by another active membership stay.
    $keep = array();
    foreach ( array_map( 'intval', (array) $member->active_product_subscriptions( 'ids' ) ) as $active ) {
        $keep = array_merge( $keep, array_map( 'intval', $wpide_mepr_ld_courses[ $active ] ?? array() ) );
    }

    // Only access this snippet granted is removed, never courses bought separately.
    $granted = array_map( 'intval', (array) get_user_meta( $user_id, 'wpide_mepr_ld_granted', true ) );
    $remove  = array_intersect( array_diff( array_map( 'intval', $wpide_mepr_ld_courses[ (int) $txn->product_id ] ?? array() ), $keep ), $granted );

    foreach ( $remove as $course_id ) {
        ld_update_course_access( $user_id, $course_id, true );
    }

    update_user_meta( $user_id, 'wpide_mepr_ld_granted', array_values( array_diff( $granted, $remove ) ) );
} );