You need a passport which is valid for at least 6 months after application. It must have at least 2 empty pages. The price of the tourist visa will vary according to your nationality, type of visa (1, 2 or multiple entries, 6 months, 1 year, etc…) and the urgency you need.
When applying for a visa, a detailed itinerary of your intended trip is required. Make sure you have all the documents, a passport photo in the exact required size (they are very picky), and bring your hotel booking confirmations, an invitation letter (if you have one) and your flight tickets.
There are multiple types of visas:
You can use it only if you are transiting in some cities in China for a max of 72 or 144 hours. This Chinese government site will help you discover if you are entitled to get the transit-free visa and for how long you can stay: http://app.www.gov.cn/govdata/html5/2018/visafreetransit/mobile/index.html
Visa on arrival
If you are in Hong Kong and want to visit Shenzhen, in China, you can ask for a visa on arrival which allows you to stay only in the Shenzhen area for a maximum of 5 days, but 1 entry. Please note that is not valid for all passports.
If you are in Macao, there is also a similar visa to enter in Zhuhai for maximum 3 days, one entry.
Read more about visa and visa requirements here.
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