I want to travel from bahrain to Cameroon will I...

We would like to inform you that the procedures are:
-A valid passport or any travel document remaining at least six (6) months.
 -Copy of the visa application form.
 -Two recent photographs size passport photos and signed.
-A copy of the international vaccination certificate against yellow fever. Vaccines and other treatments for malaria are also recommended. 
-A copy of the return ticket or flight confirmation issued by a travel agency.
-Invitation letter from the host or partner to work in Cameroon certified by local authorities
A one-time entry visa is valid for entry into Cameroon within three months, meaning that it is not valid if it is not used within the three-month period from the date of issue. However, the period in which he is allowed to stay in
Cameroon is approved by the immigration department there in the Cameroonian
entry zone.
Visas are issued for visits of three months and can be renewed by the Cameroon Immigration Department before the expiry date