Yes, it is possible to link Shopify to an existing website. Here are some of the methods based on the search results:

Using Shopify’s Buy Button: Shopify’s Buy Button allows users to add a “buy now” button to any page on their website. This button will take customers to the Shopify checkout page, where they can complete their purchase. To use Shopify’s Buy Button, users need to create a Shopify account and follow the instructions on their website. Once they have their Buy Button code, they can add it to any page on their website1 5.
Using Shopify’s Platform: Shopify’s platform allows users to create a complete online store on their website. This means that users can use Shopify to manage their products, inventory, and orders, and they can use their website to display their products and process orders. To use Shopify’s platform, users need to create a Shopify account and install the Shopify software. Once they have installed the software, they need to configure their website’s settings to allow Shopify to embed. Users can find instructions for configuring their website’s settings on Shopify’s website. Once they have configured their website’s settings, they need to add a Shopify shop to their website4 5.
Creating a Link on Wix Website: Users can easily create a link on their Wix website to sell their products via a Shopify account. They can follow the steps provided by Shopify to create a shopping cart and start selling products on their Wix website2 6.

In summary, it is possible to link Shopify to an existing website using Shopify’s Buy Button, Shopify’s Platform, or creating a link on the Wix website. It’s important to evaluate these methods based on the specific needs and goals of the business and adjust them accordingly.