You can obtain an official invitation letter from INTERMAT which will support your application for a visa at the French Embassy or Consulate in your country.
You can obtain your invitation letter when you register for your visitor badge.
Please note that the embassy or consulate are sovereign in their decision to grant a visa or reject your application, and they are your only point of contact for anny further information in this regard.
PLEASE NOTE : the invitation letter is not a pass granting you access to INTERMAT. It's purely provided to help you obtain your visa from the French Embassy or consulate;
To obtain your badge for INTERMAT, you must register as a visitor.
Visitors from countries in this list do not require a visa to enter France.
Consult the list of French embassies and consulates worldwide.