It seems there are coupon integrations for (at least) Shopify and Magento, but I can’t find any information either on the new or old APIs on how to do this for a custom integration.

Best case would be I’m just failing to find the right docs, and someone can point me at how to do this.

If, however, that doesn’t exist, then I may be able to use the “manual upload” of coupon code methods; however, it’s not clear how this works under the covers.

We’re already generating codes, which are generally referral codes on a per-customer basis. So, we could easily export these, however, it’s not clear from the upload docs how we would go about assigning them to specific customers.

Here’s an example workflow:

1. Customer visits our website and registers for our contest
2. We generate a unique code for that customer:contest, which they can use to earn extra chances to win when they share the contest via social media or email or whatnot
3. We email them with their unique referral code, that they can share, and also with a unique link to their contest page, where they can see their progress

Ideally, we’d like step 3 to be part of a Klaviyo flow, so we can send them reminders about the contest, and updates on their status.

What’s the best way to integrate the custom code and unique url into the Klaviyo flow?