To install a purchase data layer on Magento 2.4 platform, you will need to follow these general steps:
Identify the data layer variables that you want to track for your purchase event, such as order ID, order total, and product information.
Determine the method you want to use to implement the data layer, such as manually adding the code to your Magento templates or using a third-party extension.
If you choose to manually add the code, you will need to access the relevant template files in your Magento installation and add the data layer code to the appropriate sections.
If you choose to use a third-party extension, you will need to identify a suitable extension that meets your needs and install it according to the instructions provided by the developer.
Once the data layer code is in place, you will need to test it to ensure that the correct data is being captured and sent to your GTM container.
Finally, you can set up a GTM tag that listens for the purchase event and triggers any relevant marketing or analytics tags or triggers.
It's important to note that the specific steps and code required will depend on your specific requirements and the tools and extensions you are using. It's recommended to consult with a Magento developer or GTM specialist if you are unfamiliar with these technologies or require more advanced tracking.