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The aggregation layer in e-commerce is primarily defined by its role in bringing together various services, products, or information from different sources into a unified platform or portal. This layer acts as a comprehensive access point where customers can find and compare different offerings, making it easier for them to make purchasing decisions.

Portals serve as this central hub, integrating the various functionalities required for online shopping, such as product listings, reviews, and customer service options, all in one place. By facilitating access to multiple resources, portals enhance the customer experience by providing convenience and accessibility.

While platforms for product sales and online payment tools are crucial for facilitating transactions, they do not fully encapsulate the concept of the aggregation layer, which is more about the centralized point of interaction for the end consumer. Customer relationship tools, while important in managing customer interactions and feedback, are also not specifically part of defining the aggregation layer in the context of e-commerce. Thus, the identification of portals as the aggregation layer emphasizes their role in containing and presenting various aggregated services and information to the user effectively.