Sync Etsy customers with Meta custom audiences using hashed emails

Description

Quick overview
This workflow runs daily to fetch recent Etsy receipt emails via an Etsy Shop Operations sub-workflow, normalizes and SHA-256 hashes the emails, and either previews the hashed payload or uploads it to a Meta Custom Audience using the Meta Graph API.

How it works
Runs every day on a schedule.
Sets sync parameters (lookback window, maximum receipts, dry-run mode, Meta audience ID, and API version).
Requests recent Etsy receipt records from a connected Etsy Shop Operations workflow and extracts buyer/payment email addresses.
Normalizes, deduplicates, and SHA-256 hashes the email addresses to build a Meta Custom Audience upload payload.
If dry-run is enabled, returns counts and a small sample of hashes for verification.
If dry-run is disabled, sends the hashed EMAIL payload to the Meta Graph API endpoint for the specified Custom Audience.

Setup
Configure and connect the “Get Etsy customer receipts” execute-workflow step to an Etsy Shop Operations (PRO) workflow that returns receipt records including buyer/payment emails.
Create or choose a Meta Custom Audience and paste its ID into the configuration values.
Add a Meta access token to the HTTP header auth for the upload request (for example, an Authorization: Bearer header) and ensure the token has permissions to manage the selected audience.
Review and adjust the lookback window, max receipt limit, and keep dry-run enabled for initial validation before enabling live uploads.