You may need a visa for Thailand if you have a Zambian passport
Visa options for Thailand (2)
Electronic visitor visa
Travellers need a visa to visit Thailand for Business or Tourism. A Thai eVisa is the fastest and easiest way of obtaining a visa for Thailand because travellers can submit their application and supporting documents online. Once the application is approved, travellers receive their eVisa confirmation electronically.
This is not offered by sherpa°.
Apply on the government site.
You don't need a visa. You can travel to your destination for a limited stay. Be sure to check other entry requirements and how long you can stay for.