App that changes variants of product description by the utm it got from URL

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Hi all,

I am very new to the Shopify SDK, and I would like to know what is the best approach to implement an application that does the following:

1. Read the query params / UTMS from the URL.

2. According to a specific UTM change the description of a product.

Which API's should I look into?

I took a close look at the scriptTag API - and it is too slow to do such a thing.

I also played around with the product/template/asset API - just want to understand, is it the way to go?

I know this is a very general question but any advice or best practice or references will be appreciated