How metafield syncing works on Happy Birthday Marketing

The Happy Birthday Marketing Shopify app can sync birthdays with Shopify customer metafields

By default the app will use the standard facts.birth_date metafield, but you can also create your own metafield definition and then select the metafield definition in the app.

If you select your own metafield definition, the Happy Birthday Marketing app will update this metafield on the Shopify customer when the customer adds their birthday