Real-time synchronized multi-retailer cart

A method, comprising:

• a computing device comprising at least one processor and a memory sending a dynamic advertisement comprising a personalized targeted advertisement to a consumer for display on a digital device;
• said computing device customizing the targeted advertisement based on a dynamically updated consumer profile derived by said computing device from behavioral analysis, real-time activity tracking, and/or predictive analytics, the targeted advertisement offering a specific product associated with a particular brand in response to consumer interactions with the digital device received by the computing device from the digital device;
• said computing device querying a plurality of retailer data sources to identify a contextually relevant plurality of retailers that offer the product shown in the advertisement;
• said computing device applying weighted ranking criteria to said plurality of retailers to prioritize any of consumer preferences, geographic proximity, stock availability, and promotional offers;
• said computing device using said weighted ranking criteria to retrieve and aggregate data from disparate retailer user interfaces (UIs) and application programming interfaces (APIs) to assemble a retailer list;
• said computing device generating for display on the digital device a harmonized and adaptive multi-retailer interactive interface with which the assembled retailer list is presented to the consumer on the digital device to display product comparison information to the consumer for purchase decision-making;
• said computing device linking the targeted advertisement with each of the identified plurality of retailers;
• said computing device dynamically generating retailer-specific purchase pathways, said retailer-specific purchase pathways integrating with disparate retailer commerce infrastructures to provide a unified user interface via said interactive interface;
• said computing device generating a real-time synchronized multi-retailer cart for display on said digital device, said multi-retailer cart displaying the product shown in the advertisement along with a dynamically updated list of the identified plurality of retailers;
• said computing device via the multi-retailer cart:
• visually represents pricing, availability, and promotional incentives from each retailer,
• includes real-time stock validation, and
• provides a single-click purchase mechanism;
• said computing device receiving an input from the digital device indicating the consumer's selection of a specific retailer from the multi-retailer cart;
• and
• upon receiving selection of a retailer by the consumer, said computing device executing at least one of the following actions:
• saving the product into a persistent, cross-platform shopping list or digital cart that synchronizes across multiple consumer devices,
• initiating an automated checkout process via an integrated retailer commerce site or transaction processor, and
• triggering a real-time digital purchase assistant that provides the consumer with alternative buying options, discount recommendations, or loyalty rewards before finalizing the transaction.