[support] special ecommerce application

Hi folks, My client is a service provider and wants to offer his clients to view their bills on his web site. So the his clients would only be able to view the bills, but they could not set up orders in the sense of a web shop. I looked around a bit and found only few possible options, one of them being the ecommerce module for drupal. I installed Drupal and the module and set it up as far I could so far. Now it seems to me that this billing system is hardly feasible with ecommerce. Am I right here, or do I just need to delve more into the module configuration?

Best regards, Christian