Mutation.storefrontAddToCart

Add a product to the storefront cart. Auto-creates a guest quote when none exists for this session_id.

ReturnsQuote!

Signature

storefrontAddToCart(store_slug, session_id, product_id, variant_id, qty, options):Quote!

Add a product to the storefront cart. Auto-creates a guest quote when none exists for this session_id.

store_slugString!
session_idString!
product_idID!
variant_idID
qtyFloat!
optionsJSON— Personalization line-item properties: array of {code,label,value,url?,kind?}.