How to use reserved prefix in input.graphql of extension?

Retired Boards Appdev Extensions
3

Hi, thank you for your message.

I’m using of Shopify CLI (3.48.4) and I had no errors in running typegen or deploy the extension. I have made index.js that only displays input values in standard error that we can see in Shopify Partners page.

...
(input) => {
    console.error(JSON.stringify(input));
    ...
}

When I used $app in input.graphql, I got standard error like this.

{
  "paymentCustomization": {
    "metafield": null
  }
}

When I used actual value (SHOPIFY_API_KEY), I got the followings that I set.

{
  "paymentCustomization": {
    "metafield": {
      "value": "{\"methods\":[{\"name\":\"Cash on Delivery (COD)\",\"label\":\"\",\"active\":true,\"rules\":[]}]}"
    }
  }
}

I have no idea how I should set $app value.
Thank you.