Add free book buyers to marketing contacts and tags

Incomplete free-book purchase webhooks break campaign lists and fulfillment. Keep buyer records clean and trigger welcome and shipping workflows so orders process same day.

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Overview

When free-book buyers sit in raw webhooks, campaign managers and fulfillment coordinators can't act quickly and shipments or welcome campaigns are delayed. This flow captures and normalizes buyer data, then forwards a clean payload to your marketing and fulfillment systems so outreach and delivery start same day.