A computer that dynamically generates a customized second document is described. During operation, the computer receives information specifying activation of a hosted field in a document associated with a third party, where the information specifies a willingness to receive one or more messages from the computer and specifies a telephone number. In response, the computer dynamically generates the customized second document that includes information about one or more transactions (such as one or more upcoming events) of interest to an individual associated with the telephone number. Then, the computer sends a message to an address corresponding to the telephone number, where the message includes a link to the customized second document. Next, when the computer receives information specifying activation of the link from an electronic device, the computer provides information specifying the customized second document to the electronic device for display on the electronic device.