To verify a trade company in Shantou, you would typically follow these steps:

1. **Official Channels**: Begin by checking the official websites of relevant organizations such as the Shantou City Bureau of Industry and Information. These sites usually provide verified lists.

2. **Trade Registrations**: Trade companies are required to register with local authorities. You can inquire at the Trade Registration Department or Economic Development Bureau in Shantou.

3. **Business Directories**: Business directories, both online and offline, often list registered trade companies. Check websites like Shantou Business Directory or B2B China for such listings.

4. **Verification Procedures**: Depending on the authority verifying the company, they might conduct site inspections, checks against business registration records, or even perform credit assessments.

Remember that verification times can vary, and some authorities may not provide real-time updates.