curl --location 'http://localhost:8080/subscriptions/estimate?item_price_id=standard-plan-USD-Monthly' \
--header 'Content-Type: application/json' \
--header 'Accept: application/json' \
--header 'X-Profile-Id: pro_BSjmSsJE4oqVfDdiJViI' \
--header 'api-key: dev_4IM0uzCEoKQ9lkSaTUEceuErgHTSnZhcc0CsjiSc1P2jVv5W4p9nYumBWwnJLqLb'

{
    "amount": 1200,
    "currency": "USD",
    "plan_id": null,
    "item_price_id": null,
    "coupon_code": null,
    "customer_id": "Azyd6UUz25MpkdBC",
    "line_items": [
        {
            "item_id": "standard-plan-USD-Monthly",
            "item_type": "plan_item_price",
            "description": "Standard Plan",
            "amount": 1200,
            "currency": "USD",
            "quantity": 1
        }
    ]
}