If you're an online-only vape retailer in California, you need to verify your suppliers' import documentation using public databases. Check the FDA's Tobacco Product Establishment Registration to see if the manufacturer or importer is registered. Then confirm your supplier has a valid California tobacco retailer license. Also, ensure the products themselves aren't on any FDA denial list and that they comply with California's flavor ban. Keep records of all import documents, like certificates of analysis and bills of lading. This guide walks you through the process, step by step.