A business letter of responsibility is required, to be typewritten on your company letterhead and addressed to:
Embassy of Cameroon, Visa Section, Washington DC
The letter must explain all of the following:
Nature of business to be performed
Name and address of reference to be visited
This letter should request Multiple Entries visa if required
Guarantee of return transportation and sufficient funds for the visit
The letter should be signed by an officer of the company other than the applicant.
Invitation Letter
A letter of Invitation from the host Company in Cameroon is required, the exact duration of stay, place of stay and hosts name and contact information should be explicitly mentioned on the invitation. The letter must be legalized by the local immigration or police authorities.