https://github.com/magesuite/back-in-stock
It allows to receive email notifications when a product is again in stock. Can be extended with Magesuite_PwaNotifications and Magesuite_BackInStockPwaNotifications
Installation
This module is optional
composer require "creativestyle/magesuite-back-in-stock" ^1.0.0
User manual
4.4.Back-In-Stock Subscriptions
Admin settings
In order to activate this module go to:
Stores -> Configuration -> Magesuite -> Back in Stock Subscriptions and select Yes in the Enabled dropdown. With its activation additional tab Back in stock can be found on every product detail page.
Above there are also a few optional settings visible above - they are well described and can be adjusted per clients request.
Another set of settings are available in Email Configuration - they’re described in user manual linked above.
Frontend
In the buybox short form for subscribing to back-in-stock email notifications is displayed.
When confirmation is required there is a message visible and email is being sent:
When confirmation is not required success message is displayed:
Logged-in users can unsubscribe from all back-in-stock notifications in the admin panel:
Once product is back in stock every subscriber will be notify by email. This action can be also triggered manually for every product on it’s page in admin panel.