1-click integration on a registered domain or subdomain refers to the process of quickly and easily linking a website or web page to another platform or service, such as an e-commerce platform like Shopify. This allows users to access and utilize the features and functionality of the linked platform directly from their website or web page, without the need for extensive setup or configuration. The term “1-click” implies that the integration process can be completed with minimal effort and without the need for technical expertise.