How to pass browser cookies for attribution to order creation webhook

Shopify Partner
20 1 1

We're in the process of providing affiliate offers for some of our products. In order to attribute the referral, we need to collect a cookie containing a token from the customers browser, and then use that token value to send off to a third party API to attribute the affiliate purchase during the order create webhook request.


I've seen a few mentions of providing webhooks with metafields, but I'm unsure how to connect the dots so that this cookie value is stored as a metafield for that order.


What are others doing in similar situations?


We have a custom app that subscribes to cart, checkout and order webhooks. So a combination of those should get me pretty close. 


Many thanks.

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