Unimark Pvt Ltd offers 3-D Secure Card. Unimark offers technological End-To-End Payment Platform test tool to make sure that the payment system runs flawless. 3-D Secure is the standard for security of online transactions over the internet. The 3-D Secure name refers to the three processing domains of a card transaction and the 3-D Secure protocol defines the roles and responsibilities of all parties involved: