Get selling plans for products

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

[
  {
    "get__typename": "<string>",
    "id": "<string>",
    "sellingPlanId": "<string>",
    "sellingPlanName": "<string>",
    "productId": "<string>",
    "sku": "<string>",
    "title": "<string>",
    "variantId": "<string>",
    "quantity": 123,
    "customAttributes": [
      {
        "get__typename": "<string>",
        "key": "<string>",
        "value": "<string>"
      }
    ],
    "lineDiscountedPrice": {
      "get__typename": "<string>",
      "amount": {}
    },
    "variantImage": {
      "get__typename": "<string>",
      "transformedSrc": {}
    },
    "variantTitle": "<string>",
    "currentPrice": {
      "get__typename": "<string>",
      "amount": {}
    },
    "discountAllocations": [
      {
        "get__typename": "<string>",
        "amount": {
          "get__typename": "<string>",
          "amount": {}
        },
        "discount": {
          "get__typename": "<string>"
        }
      }
    ],
    "pricingPolicy": {
      "get__typename": "<string>",
      "basePrice": {
        "get__typename": "<string>",
        "amount": {}
      },
      "cycleDiscounts": [
        {
          "get__typename": "<string>",
          "afterCycle": 123,
          "computedPrice": {
            "get__typename": "<string>",
            "amount": {}
          },
          "adjustmentValue": {
            "get__typename": "<string>"
          }
        }
      ]
    },
    "taxable": true
  }
]