Fireworks and firecrackers shops are rarely legal, because the safety supervision bureau only issues temporary licenses to sales booths during the New Year, and the licenses will be automatically cancelled after the 16th day of the first month. If you have been in business for many years, unless you apply for business projects such as weddings, you need to "fix the line between heaven and earth" to really do it. If you transport, you must go to the local public security bureau for approval. The specific departments vary from place to place. This department is mainly responsible for the clamp and fireworks transport license.
Having said that, we should lay a solid foundation. Say so much first, ask me if you don't understand anything.