Securing private user information in multi-party-hosted computing device transactions

A computer-implemented method, comprising:

• at a server separate from a merchant server and separate from a payment processor server:
• receiving, from the merchant server and for a transaction with a merchant operating the merchant server, a first portion of a customer's credit card number, the first portion including one or more numbers of the customer's credit card number but not all of the numbers of the customer's credit card number;
• transmitting data to a computing device operated by the customer for rendering a web page that requests a second portion of the customer's credit card number, the second portion corresponding to the remaining one or more numbers of the customer's credit card number not specified by the first portion;
• receiving, from the computing device operated by the customer, the second portion of the customer's credit card number;
• transmitting, to a payment processor server, a complete version of the customer's credit card number assembled from at least the first portion and the second portion;
• receiving, from the payment processor server, a digital token from the payment processor server, the digital token being unique to the transaction;
• and
• transmitting to the merchant server data indicating that the transaction is authorized and ready to be completed.

A computer-implemented method, comprising:

• at a server separate from a merchant system/server and separate from a payment processor server:
• receiving data indicative of a transaction to be closed for a customer from the merchant server;
• generating a unique identification value for the transaction;
• transmitting, to the merchant system/server, identifying information for a Uniform Resource Locator (URL) that is unique to the transaction;
• receiving a request to view a web page at the URL that is unique to the transaction;
• and
• generating data for a hosted-pay web page unique to the transaction, the hosted-pay web page including an embedded portion that facilitates payment directly with a payment processor server and not with the merchant system/server.