How notifications can be managed through flow builder for Opt-In?

Here's a guide on how to manage notifications using the Flow Builder:

1) In the backend, go to My Extensions > Configurations of the Back in Stock Notifications plugin, and enable the switch for "Use Flow Builder."

2) Go to Settings > Flow Builder, and create a new flow. You can refer to the video linked below for a detailed guide, as well as the instructions provided in the README or installation manual.

3) From the shop, subscribe to the stock notification.

4) The recipient will immediately receive a Double Opt-In email.

5) When the stock is updated, the back-in-stock email will be automatically sent via the flow trigger.

For a better understanding, please refer to this video:

https://drive.google.com/file/d/1ZBLzBwSe1zGx_QeNgqpysCK8_LIv3BAB/view?usp=sharing