Just what the subject says. I've already checked a dozen of apps from the top of the list and had no luck. The main requirement is to ship (and bill) each 1st of March/July/November regardless of joining up date. Thank you!

It works now (but you still can't mutate actual articles) source: https://shopify.dev/changelog/graphql-admin-api-support-for-metafield-connections-in-online-store-objects Effective April 29, 2024As of version 2024-07 of the GraphQL Admin API, you ca...

https://SHOP_URL/cart/update?updates[VARIANT_ID]=QTY&return_to=/discount/DISCOUNT_CODE?redirect=/collections/COLLECTION_HANDLEenjoy 