Website-specific electronic signature containing personalized logo

The present invention involves the creation of a website-specific electronic signature containing a personalized logo via a mechanism for on-line assembly of image parts to obtain personalized image. The present invention provides two applications of the website-specific electronic signature containing a personalized logo, a virtual payment card and an on-line binding purchase order. The present invention further provides two methods and a system for e-commerce use of the virtual payment card and the on-line binding purchase order. The safer and less costly on-line transaction methods and the more trustable on-line seller-buyer agreements offered by the present invention can help promote the trustworthiness and the brand value of an e-store or a payment institution.