How to trigger events in opencast v4.x - opencart

Can anyone please share a tutorial to capture the product add/update and product add to cart and cart update events implementation in OpenCart V4.
I was using that events by implementing them in install.xml, but I am not getting any clue how to implement them in v4.
Please help

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Moving Sitecore Contact from a list to another

How to remove Sitecore Contact from a list and add it to another list programmatically? Im working on Sitecore 9.1
You can use List Manager API to perform these tasks. ISubscriptionService has two methods Subscribe and Unsubscribe which will fulfill your requirements. Note that ListManager API is available on CM only.
You can find more information on Sitecore documentation
https://doc.sitecore.com/developers/91/sitecore-experience-manager/en/the-list-manager-api.html

Product Advertising API with notification?

I am new to Product Advertising API and wondering if there is way programmatically watch any events on products. Sort of webhook that will be trigger when whatever event happened. For example: Customer left review on product and I would may be post that change to my backend for further analysis.
After reading more and googling. It seems there is no such interface. Pulling reviews is not easy at it seems: Is there an Amazon.com API to retrieve product reviews?

Upload products to amazon and retrive/import/export/ orders from amazon to own store

My company is using oscommerce 2.2ms and php 4. We want to upload our products to amazon shop. We have found magnalister and holbi connectors that we want to use but we cannot because we aere running php version 4.
So, I decide to create my own connector having these featurs:
Upload products from my shop to the marketplace
import orders from the marketplaces
Synchronise order status between shop and marketplace
Manage orders, invoices and export to my site
The Problem is:
1.) There are huge of api's that i cannot understand which is for what, so i little bit confused.
2.) I tried to use this Api, but this retrive all products that are avilable on amazon(searched catorgory).
Question is: Which Api i have to use ?
Please help me. Thanks in advance

Integrate Slack with Opencart

we want to implement a slack snippet in Opencart 2.x such that after a successful checkout, there will be an alert on our slack channel. Where can one place this snippet in Opencart?
Thanks.
Ideally, you should create an event (try attaching it to pre.order.add), but if you need it done quickly and dirtily, you'll find the code that adds a new order in /catalog/model/checkout/order.php.

How to use Opencart Product Profile?

anyone know how to apply Opencart 1.5.6 new feature product profile? which is located in the admin menu - catalog - profile ?
I heard it can be used to break payment into several part, but i don't understand how it really works. Can i use it to let my buyer pay in 50% first then after my product is ready to ship, they pay the rest 50% again with that feature?
Thank You very much.
follow the documentation and dont forget to enable payment gateway like paypal express
http://docs.opencart.com/display/opencart/Profiles