What are the visa & residency requirements in Senegal?

"In order to visit Senegal, travelers must obtain a visa prior to arrival. The process of applying for a visa involves submitting an application form, a valid passport, two passport-sized photographs, and proof of sufficient funds to cover the duration of the stay. Depending on the purpose of the visit, additional documents may be required. In order to obtain residency in Senegal, applicants must submit an application form, a valid passport, two passport-sized photographs, proof of sufficient funds to cover the duration of the stay, and a valid work permit or proof of employment. Depending on the purpose of the stay, additional documents may be required. Once the application is approved, the applicant will receive a residence permit," remarked another expat in Senegal.