curl --request POST \
  --url https://staging.api.commercengine.io/api/v1/{store_id}/storefront/subscriptions \
  --header 'Content-Type: application/json' \
  --data '
{
  "invoice_items": [
    {
      "product_id": "<string>",
      "variant_id": "<string>",
      "quantity": 123
    }
  ],
  "start_date": "2023-12-25",
  "end_date": "2023-12-25",
  "coupon_code": "<string>",
  "is_prepaid": false,
  "usage_based_billing": false,
  "usage_based_tiers": [
    {
      "up_to": 123,
      "price_per_unit": 123
    }
  ],
  "grace_period_days": 0,
  "is_cancellation_allowed": true,
  "days_until_cancellation_allowed": 3
}
'

{
  "message": "<string>",
  "success": true,
  "content": {
    "subscription": {
      "id": "<string>",
      "plan_id": "<string>",
      "plan_name": "<string>",
      "price": 123,
      "status": "created",
      "start_date": "2023-12-25",
      "end_date": "2023-12-25",
      "trial_days": 0,
      "trial_start_date": "2023-12-25",
      "trial_end_date": "2023-12-25",
      "next_billing_date": "2023-12-25",
      "last_payment_date": "2023-11-07T05:31:56Z",
      "pause_start_date": "2023-12-25",
      "pause_end_date": "2023-12-25",
      "billing_frequency": "monthly",
      "billing_interval": 1,
      "billing_limit": 123,
      "shipping_frequency": "monthly",
      "shipping_interval": 1,
      "shipping_limit": 123,
      "coupon_id": "<string>",
      "coupon_code": "<string>",
      "coupon_discount_percent": 0,
      "coupon_discount_amount": 0,
      "coupon_redemption_limit": 0,
      "is_prepaid": false,
      "usage_based_billing": true,
      "usage_based_tiers": [
        {
          "up_to": 123,
          "price_per_unit": 123
        }
      ],
      "grace_period_days": 0,
      "is_cancellation_allowed": true,
      "days_until_cancellation_allowed": 3,
      "currency": {
        "name": "<string>",
        "code": "<string>",
        "symbol": "<string>"
      },
      "metadata": {},
      "created_at": "2023-11-07T05:31:56Z",
      "modified_at": "2023-11-07T05:31:56Z",
      "invoice_items": [
        {
          "product_id": "<string>",
          "variant_id": "<string>",
          "product_name": "<string>",
          "variant_name": "<string>",
          "product_image_url": "<string>",
          "sku": "<string>",
          "quantity": 123,
          "listing_price": 123,
          "selling_price": 123,
          "tax_type": "<string>",
          "tax_rate": 123,
          "price_including_tax": true,
          "selling_price_excluding_tax": 123
        }
      ],
      "billing_address": {
        "first_name": "<string>",
        "last_name": "<string>",
        "country_code": "<string>",
        "phone": "<string>",
        "email": "<string>",
        "address_line1": "<string>",
        "address_line2": "<string>",
        "landmark": "<string>",
        "pincode": "<string>",
        "city": "<string>",
        "state": "<string>",
        "country": "<string>",
        "tax_identification_number": "<string>",
        "business_name": "<string>",
        "is_phone_verified": true,
        "is_email_verified": true,
        "id": "<string>",
        "is_default_billing": true,
        "is_default_shipping": true,
        "nickname": null
      },
      "shipping_address": {
        "first_name": "<string>",
        "last_name": "<string>",
        "country_code": "<string>",
        "phone": "<string>",
        "email": "<string>",
        "address_line1": "<string>",
        "address_line2": "<string>",
        "landmark": "<string>",
        "pincode": "<string>",
        "city": "<string>",
        "state": "<string>",
        "country": "<string>",
        "tax_identification_number": "<string>",
        "business_name": "<string>",
        "is_phone_verified": true,
        "is_email_verified": true,
        "id": "<string>",
        "is_default_billing": true,
        "is_default_shipping": true,
        "nickname": null
      }
    }
  }
}