Could you please add whitelist http://ssi.com.vn
The API link: https://www.ssi.com.vn/khach-hang-ca-nhan/fast-connect-api
Docs link in above page: http://ftp2.ssi.com.vn/Customers/GDDT/Document/SSI_FastConnectTrading_Specs.pdf http://ftp2.ssi.com.vn/Customers/GDDT/Document/SSI_FastConnectData_Specs.pdf
Many thanks,