Gift cards let you define a marketing template (name, image, face value, currency) and issue redeemable codes with a monetary balance. Codes can exist without a member assignment, or be linked to a member account. Balance is stored in cents on each code for internal cards; Shopify-linked cards will query external balance in a future release.

Typical workflow:

1. Create a gift card template (POST /v1/gift-card).
2. Issue one or more codes (POST /v1/gift-card/{gift_card_id}/codes/create).
3. Optionally assign a code to a member (POST /v1/gift-card/code/{code}/assign).
4. Check balance before checkout (GET /v1/gift-card/code/{code}).
5. Redeem fully or partially at payment time (POST /v1/gift-card/code/{code}/redeem).
6. Refund a previous redemption if needed (POST /v1/gift-card/transaction/{transaction_id}/refund).

OAuth scopes: read_gift_card for read endpoints, write_gift_card for create/update/redeem/refund.

Create a new gift card marketing template.