List products attached to selling plans

curl --request GET \
  --url https://www.myshop.com/apps/memberships/cp/api/data/selling-plan-products

{
  "products": [
    {
      "get__typename": "<string>",
      "id": "<string>",
      "handle": "<string>",
      "title": "<string>",
      "featuredMedia": {
        "get__typename": "<string>"
      },
      "vendor": "<string>"
    }
  ],
  "pageInfo": {
    "get__typename": "<string>",
    "hasPreviousPage": true,
    "hasNextPage": true,
    "startCursor": "<string>",
    "endCursor": "<string>"
  },
  "productHandleData": {}
}