Based on documentation you provide REST API endpoint to adjust gift card balance https://shopify.dev/docs/api/admin-rest/2023-07/resources/gift-card-adjustment. I am able to create gift cards, retrieve gift cards via REST API but when I am trying to use this endpoint I just get error 404 {“errors”:“Not Found”}. Is there something you need to grant for me because initially I wasn’t able to use gift card api before you granted it to me when I asked it separately.
So it does seem that the gift_card_adjustments access scope needs to be manually enabled. You’ll need to open a support interaction through your partner dashboard to have this scope enabled by our internal partner support team.