This broad question involves several further questions. First, the type of product or service could involve regulatory or quality issues (e.g. technical products or food or medical products). Secondly, the type of customer needs to be identified: is it a public-sector agency? – are the sales subject to calls for tenders? Are they consumers? – in which case French consumer protection rules will come into play. Or it is a business-to-business transaction?
The form of sales network will also have a bearing on the legal issues: sales through physical outlets or over the internet. The general terms and conditions of sale will need to be adapted to each type of sales medium and category of customer.