In addition to transactional notifications, i.e. those that are automatically sent to your clients at each step of their order processing, or all those that affect the purchase process, you can send push notifications to your clients and leads at any time.
Some time ago, the main marketing approach for ecommerce was to use email campaigns. While emails are still relevant, push notifications have become a more convenient way to target the audience. 

Notifications are instantaneous

In an increasingly fast-paced world, it’s necessary to be able to get in touch with your clients quickly and directly. Informing about a price drop, offering an exclusive flash sale, reacting to a competitor's price drop, there are many reasons to want to inform your clients immediately.
Notifications are perfectly adapted to this world. The reception of a notification is indeed immediate and its reading too.

Notifications are mobile friendly

Even though notifications work on all devices (desktops, tablets and mobiles), they are particularly adapted to mobiles.
The format of push notifications is really adapted to mobiles and to the use we make of our mobiles. If not opened right away, the notification is stored in the mobile notification centers, and always visible on my app icon. Hard to miss.

Notifications are adapted to e-commerce

Notifications are perfectly adapted to e-commerce. Customers are also more and more mobile and therefore demand to receive information where they are.
Notifications also allow to personalize marketing messages, which goes with the flow of history: more and more personalization.
With a cost of sending almost zero per notification and a high ROI, notifications are a good way to monetize your traffic and your e-commerce site in an increasingly competitive environment.