public function lost_password() {

		// Invalid nonce or the form wasn't submitted.
		if ( ! llms_verify_nonce( '_lost_password_nonce', 'llms_lost_password', 'POST' ) ) {
			return null;
		}

		/**
		 * Fire an action immediately prior to the lost password form submission processing.
		 *
		 * @since 3.37.17
		 */
		do_action( 'llms_before_lost_password_form_submit' );

		$err   = new WP_Error();
		$user  = false;
		$login = llms_filter_input_sanitize_string( INPUT_POST, 'llms_login' );

		// Login is required.
		if ( empty( $login ) ) {
			$err->add( 'llms_pass_reset_missing_login', __( 'Enter a username or e-mail address.', 'lifterlms' ) );
		} else {

			// Locate the user.
			$field = strpos( $login, '@' ) ? 'email' : 'login';
			$user  = get_user_by( $field, $login );

			// No user found.
			if ( ! $user ) {
				$err->add( 'llms_pass_reset_invalid_login', __( 'Invalid username or e-mail address.', 'lifterlms' ) );
			}
		}

		/**
		 * Ensure 3rd parties that don't use the 2nd param of `lostpassword_post` still work with our reset functionality.
		 *
		 * This specifically adds support for WordFence's "max allowed password resets" under brute force protection, but
		 * might be useful in other scenarios.
		 */
		$_POST['user_login'] = $login;

		/**
		 * Fires before errors are returned from a password reset request.
		 *
		 * Mimics WordPress core behavior so 3rd parties don't need to add special handlers for LifterLMS
		 * password reset flows.
		 *
		 * @since 3.37.17
		 *
		 * @link https://developer.wordpress.org/reference/hooks/lostpassword_post/
		 *
		 * @param WP_Error      $err  A WP_Error object containing any errors generated by using invalid credentials.
		 * @param WP_User|false $user WP_User object if found, false if the user does not exist.
		 */
		do_action( 'lostpassword_post', $err, $user );

		// If we have errors, output them and return.
		if ( ! empty( $err->errors ) ) { // @todo: When we can drop support for WP 5.0 and earlier we can switch to $err->has_errors().
			foreach ( $err->get_error_messages() as $message ) {
				llms_add_notice( $message, 'error' );
			}
			return $err;
		}

		// Set the user's password reset key.
		$key = get_password_reset_key( $user );
		if ( is_wp_error( $key ) ) {
			llms_add_notice( $key->get_error_message(), 'error' );
			return $key;
		}

		// Setup the email.
		$email = llms()->mailer()->get_email(
			'reset_password',
			array(
				'key'           => $key,
				'user'          => $user,
				'login_display' => 'email' === $field ? $user->user_email : $user->user_login,
			)
		);

		// Error generating or sending the email.
		if ( ! $email || ! $email->send() ) {

			$err->add( 'llms_pass_reset_email_failure', __( 'Unable to reset password due to an unknown error. Please try again.', 'lifterlms' ) );
			llms_add_notice( $err->get_error_message(), 'error' );
			return $err;

		}

		// Success.
		llms_add_notice( __( 'Check your e-mail for the confirmation link.', 'lifterlms' ) );
		return true;

	}