What need to get tourist visa to visit Nigeria ? I have an American passport but live in China

You need to prepare the following documents:
1. Passport and copy of Passport Data Page
2. Application Form (with one recent passport photograph attached)
3. Documentary evidence of online payment
4. Possession of return air tickets / itinerary
5. Evidence of hotel reservation / accommodation
6. Your residence permit in PRC
And then apply for ti from the embassy of Nigeria.