Developer documentation for 3PL / fulfillment network integration.
When gift orders arrive in your Shopify admin, the customer’s gift option information is included on the order details page. This includes the gift option, the gift message fields, and the bundle so you know which product each gift option is intended for.
If you are working with a 3PL / external fulfillment partner who has access to pull orders from your store through the Admin API - you can let them know where the information is stored, or refer them here, to this article.
Order attributes
Refer to the API documentation for: Order.customAttributes.
These are added when a customer chooses a Gifting for Orders gift option, with or without a gift product connected.
Line-item attributes
Refer to the API documentation for: LineItem.customAttributes.
These are added when a customer chooses a Gifting for Products gift option, with or without a gift product connected. When a Gifting for Orders gift option has a gift product connected, the gift product’s line item also carries the gift message fields.