Abstract: An e-commerce solution includes a website, created or pre-existing, comprised of web pages each having a single code snippet with reference to a promotion server. Upon access by a visiting customer, the single code snippet is executed in the customer's web browser to retrieve customized or promotional code. The promotional code may modify the existing webpage elements to add, remove, or modify webpage elements and display dynamic, personalized messages and offers within the existing webpage. Through inclusion of the same single snippet on all web pages, visitors may be tracked throughout the website to present consistent messages and carry promotional offers through order checkout. Management of promotions through a web interface and the single snippet allows integration and operation with existing websites without extensive technological effort or expense.