I am planning a trip to ShenZhen for 2 days

Hi, I am planning a trip to ShenZhen for 2 days & wondering can I apply the Visa upon arrival at Shenzhen custom checkpoint? I heard someone had mentioned about this 'visa on arrival'. I had went to check with Chinese Embassy service centre in S'pore, surprisingly they are not aware of this 'visa on arrival'.

Can someone advise that there is this 'visa on arrival' that can really apply the Visa in Shenzhen? (Just want to ensure the visa can successfully applied without any delay)

Thank you very much!