Devices, methods, and computer-readable media for redemption header for merchant offers

A method implemented with a server system and a user computing device, the method comprising:

• sending, by the server system, via a network, from a first domain, at least part of a first webpage to a web browser executing on the user computing device, at least some static content of the at least part of the first webpage is sent to the web browser by a content delivery network, wherein the sending by the server system comprises:
• receiving, with the server system, a request from the web browser for data, wherein the server system comprises an application program interface (API) server configured to provide a response to the request and a web server configured to provide a response to a request for a coupons interface webpage;
• determining, with the server system, that a user of the user computing device is associated with a device independent user profile;
• accessing, with the server system, the device independent user profile based on an identifier sent by the web browser;
• selecting, with the server system, one or more of a plurality of coupons based on the device independent user profile, wherein the device independent user profile comprises account information related to a third-party service with which the user has an account, a credential issued by the third-party service and an expiration time of the credential;
• and
• sending, with the server system, information related to the plurality of coupons in response to the request;
• displaying, by the web browser, the information related to the plurality of coupons in the first webpage;
• storing, by the web browser, in client-side browser-accessible storage, identifiers of one or more of the plurality of coupons, the identifiers having been sent from the first domain, wherein:
• the web browser implements a security policy limiting cross-domain access to browser memory by web content, and
• the web browser has an added program installed in the web browser configured to bypass the security policy and provide cross-domain access to browser memory;
• and
• after the at least part of the first webpage is sent, coordinating, by the web browser, consistent content across domains after the web browser navigates to a second webpage from a second domain different from the first domain, wherein consistent content across domains is coordinated by:
• accessing, with the added program installed in the web browser, the identifiers of one or more of the plurality of coupons in the client-side browser-accessible storage after the web browser has navigated to the second webpage and while the web browser is displaying content of the second domain;
• and
• causing the web browser to display the second webpage, concurrently with displaying information related to one or more of the plurality of coupons in a redemption bar, in response to accessing the identifiers of one or more of the plurality of coupons after the web browser has navigated to the second webpage, wherein the redemption bar is at least partially overlaid on the displayed second webpage and at least some content of the redemption bar is retrieved asynchronously relative to loading of the second webpage.