curl --request POST \
  --url https://api.yorlet.com/v1/subscription_items/{id} \
  --header 'Authorization: <api-key>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "price_data": {
    "amount": 123,
    "tax_percent": 123
  },
  "description": "<string>",
  "metadata": {},
  "proration_behavior": "create_prorations",
  "schedule": [
    {
      "amount": 123,
      "effective_at": 123
    }
  ],
  "tax_rate": "<string>",
  "transfer_behavior": "automatic",
  "transfer_destination": "<string>"
}
'

{
  "id": "<string>",
  "created": 123,
  "object": "subscription_item",
  "description": "<string>",
  "price": "<string>",
  "price_data": {
    "amount": 123,
    "currency": "gbp",
    "recurring": {
      "interval": "<string>",
      "interval_count": 123
    },
    "tax_percent": 123,
    "type": "recurring"
  },
  "schedule": [
    {
      "amount": 123,
      "effective_at": 123
    }
  ],
  "subscription": "<string>",
  "tax_rate": "<string>",
  "transfer_behavior": "automatic",
  "transfer_destination": "<string>",
  "type": "charge",
  "unit": "<string>",
  "account": "<string>",
  "deleted": false,
  "metadata": {}
}