Normally the supplier will provide the documentation for Customs Clearance.
Before importing goods from other countries, you need to check the documentation required by financial institution or the importing country regulation in your country. The rules, regulations, and laws are a bit different from country to country.
When you place order with the supplier on Aliabba.com, please fully discuss the import documentation issue with your supplier in avoid of any misunderstanding and shipment stuck at Customs.