Generate bundle-specific discount code

curl --request PUT \
  --url https://membership-admin.appstle.com/api/external/v2/subscription-bundlings/discount/{token} \
  --header 'Content-Type: application/json' \
  --data '
{
  "cart": {
    "token": "<string>",
    "note": {},
    "attributes": {},
    "original_total_price": 123,
    "total_price": 123,
    "total_discount": 123,
    "total_weight": 123,
    "item_count": 123,
    "items": [
      {
        "id": 123,
        "properties": {},
        "quantity": 123,
        "variant_id": 123,
        "key": "<string>",
        "title": "<string>",
        "price": 123,
        "original_price": 123,
        "discounted_price": 123,
        "line_price": 123,
        "original_line_price": 123,
        "total_discount": 123,
        "discounts": [
          {}
        ],
        "sku": "<string>",
        "grams": 123,
        "vendor": "<string>",
        "taxable": true,
        "product_id": 123,
        "product_has_only_default_variant": true,
        "gift_card": true,
        "final_price": 123,
        "final_line_price": 123,
        "url": "<string>",
        "featured_image": {
          "aspect_ratio": 123,
          "alt": "<string>",
          "height": 123,
          "url": "<string>",
          "width": 123
        },
        "image": "<string>",
        "handle": "<string>",
        "requires_shipping": true,
        "product_type": "<string>",
        "product_title": "<string>",
        "product_description": "<string>",
        "variant_title": {},
        "variant_options": [
          "<string>"
        ],
        "options_with_values": [
          {
            "name": "<string>",
            "value": "<string>"
          }
        ],
        "line_level_discount_allocations": [
          {}
        ],
        "line_level_total_discount": 123
      }
    ],
    "requires_shipping": true,
    "currency": "<string>",
    "items_subtotal_price": 123,
    "cart_level_discount_applications": [
      {}
    ]
  }
}
'

{
  "discountCode": "<string>",
  "errorMessage": "<string>",
  "discountNeeded": true
}