i want to create a dynamic remarketing campaign in Google Ads, but i have to let GTM know where to extract the information for ecomm_prodid, ecomm_pagetype, ecomm_totalvalue and ecomm_category from my website. I understand that i have to create a Data Layer Variable but i just don't know how to make those tags extract the necessary info from my website. I also know that you should be able to see in Google Tag Assistant the Metadata for your products (price, brand, category etc) in the Dynamic Remarketing Tag. Unfortunately i cannot add code to my website as it was created on a platform that doesn't allow custom code, so i have to use GTM.

For example the class for the price is: fPrice -g-product-final-price-258. Shouldn't ecomm_totalvalue take info from this class? I tried reading Help pages from google but they are soooo confusing, i cannot understand them.

If anyone would help me with this i would be very grateful.

Thanks