These are the general S.A requirement

Valid international passport duly signed by the holder
2. Two (2) passport photographs
3. Visa application form duly completed (black ink)
4. Invitation letter/confirm hotel booking from South Africa
5. Introduction / reference letter from Nigerian employer / business / organization accompanied by certificate of incorporation
6. Proof of funds ( six months recent bank statements, salary advice, pay slips for personal applications, if company sponsor submit sponsorship letter and company’s bank statements.
7. Copy of Bio-data (personal detail page of your passport)
8. The visa fees for now is #8,600 ( we be reviewed annually)
9. Married couples must submit their marriage certificates
10. Minor ( under 18years of age must have parental consent letter signed by both parents and birth certificate)
11. All fees payable by valued card

Okay, for the benefits of Nigerians that envision themselves in South Africa. Either for business, study, medical, tourist, religious, marketing research, holiday etc I have some great information's for them.
There are alot of Nigerians applying for different country visa and the intending country embassies refuses them the visa.
Therefore, No any embassies in the world have the right to refuse anybody visa because economic wise they are making money from the applicant.
These are some of the reason(s) why they refuse applicant a visa
1. Physical appearance ( don't forget the adage that says the way you look, that is the way you will be attending to)
2. the way you respond to questions
3. your documents
4. application form
5. not adhere to lay down rules
6. no good intention
7. not involving God in their plan
8. no good plans
9. no genuine require documents
E.T.C

I would have love to share more tips on how I obtain my first south Africa visa and how you too can! but I have created a free loaded report on that. if you are interested in the report don't hesitate to mail me on therichson@gmail.com or call me +2348096754252, +2348061314784. For quick responds tag your message with SOUTH AFRICA VISA