Methods and a computer system for dynamically generating an embedded payment interface are described herein. The method includes obtaining rules that define a desired configuration of the embedded payment interface. The method also includes storing rules, storing a default interface template having a default configuration, and receiving an access message indicating that the webpage is accessed at a remote computing device, the access message including a plurality of data elements associated with the webpage and the access of the webpage by the remote computing device. The method also includes accessing the default interface template, generating customization commands that define an output configuration of the embedded payment interface by applying the rules to data elements, applying the customization commands to the default interface template to produce a payment interface having the output configuration corresponding to the desired configuration, and embedding the payment interface in the accessed webpage.