Where can I do the refund for the Shanghai public transportation card? At which station?

At some subway stations, you could refund the card and withdraw the balance. Here they are:
Line 1 - Hanzhong Rd., Hengshan Rd., Jinjiang Park;
Line 2 - Jiangsu Rd., East Nanjing Rd., Century Park, Songhong Rd.;
Line 3 - Dongbaoxing Rd., Zhenping Rd., Caoxi Rd., North Jiangyang Rd.;
Line 4 - Yangshupu Rd.