E-commerce both impacts - and is impacted by - many enterprise departments which have their own KPIs, budgets, decision making rules and goals. Departments include: sales, marketing, IT, finance, logistics, buyers, security, HR, legal, and more. Big changes, like implementing enterprise e-commerce platforms or significant changes in business processes, usually require significant energy and time.
International variability creates an additional challenge on top of organizational complexity. Involving additional regions or countries in an e-commerce solution adds additional stakeholders, local laws, customs. For example, local tax laws (which may impact pricing), legal requirements and practices, HR specific, cultural differences all are areas enterprises need to consider during their e-commerce planning.
The complexity of enterprise IT is often a result of past business growth, acquisitions, and IT-department mergers. Enterprise IT infrastructures manage a mix of software, legacy enterprise e-commerce solutions, and a large variety of local and industry specific software (like bookkeeping, legal, ERPs etc.).
All that creates challenges for enterprise companies that must be mitigated by adequate architecture planning.