Fetching data from external APIs in the Checkout

[NicoSpoke]

When a user lands on the Checkout, I would like to make an external API call to fetch some data and store this data in cookies. Very simple stuff, I don't even want to modify any business logic in the Checkout. 

Do I use a Checkout UI function even tho I don't really want to output a UI element? Do I use a backend function even though I don't want to interact with Shopify's backend logic?

Any advice is appreciated

[Liam]

Hi Nico,

Have you looked into using web pixels for this use case? I don't think storing data to a cookie would be possible due to the sandboxed nature of checkout extensions.