Amazon uses category, product, and brand-level restrictions to control who may sell certain items. Approval may require invoices, compliance documents, certifications, product testing, or proof that inventory came from an authorized supply chain. Requirements are particularly important in health, beauty, food, jewelry, automotive, collectibles, and other regulated or high-risk categories. Even an approved seller must follow listing, labeling, safety, authenticity, and restricted-products policies.
eBay generally has fewer broad "gated category" workflows, but it is not restriction-free. Its prohibited and restricted items policies cover weapons, hazardous materials, recalled goods, counterfeit products, medical items, and many other categories. Some listing formats and product types also have additional eligibility requirements.
Before purchasing inventory, check the exact marketplace, category, brand, and condition rules. A profitable product becomes an expensive mistake if a listing is removed, inventory is stranded, or the account is restricted. Sellers should keep supplier invoices, authenticity records, safety documentation, and accurate condition notes for both platforms.