Cart Transform API access custom metafields from shop or similar

[MHew]

Hi all,

I am using the Cart Transform API to modify pricing depending on the user selections within a product builder, think dimensions/colour etc. It is not possible to use variants as the breakpoints are quite dynamic and there are multiple variables and price points at play.

I have all of the logic for pricing worked out. And i know how to modify the price with the Cart Transform API. But for the life of me i cannot see how to get the pricing data needed for the transformation into my cart transformation function.

Here is my RunInput,

query RunInput {
  presentmentCurrencyRate
  cart {
    lines {
      id
      merchandise {
        ... on ProductVariant {
          id
          __typename
          product {
            title
          }
        }
      }
      attribute {
        key
        value
      }
    }
  }
  shop {
    metafield(namespace: "prices", key: "pricing") {
        type
        value
    }
  }
}

I am getting the currencyRate, the cart items and attempting to get the pricing metafield which i created on the Shop metafields on a custom namespace using

mutation MetafieldsSet($metafields: [MetafieldsSetInput!]!) {
  metafieldsSet(metafields: $metafields) {
    metafields {
      key
      namespace
      value
      createdAt
      updatedAt
    }
    userErrors {
      field
      message
      code
    }
  }
}

with the appropriate variables, and when calling

query {
  shop {
    id
    metafields(first: 10 namespace: "prices") {
      nodes {
        id
        namespace
        key
        value
        definition {
          access {
            admin
            customerAccount
            grants {
              access
            }
            storefront
          }
        }
      }
    }
  }
}

I can see the metafield, happy days!

However, when i get the output after the transformation takes place, i get the following:

  "cart": {
    "lines": [
      {
      ...
      },
      {
      ...
      }
    ]
  },
  "shop": {
    "metafield": null
  }

I am thinking maybe it is null due to access permissions? I have tried to create a definition on the shop level metafield, but alas you cannot modify the access permissions of this owner type.

Other methods i've tried: API call from within the run.ts (not possible due to network restriction). This includes the use of async functions too. which aren't allowed.

Appreciate any input, thanks.