curl --request POST \
  --url https://api.sandbox.z2pay.com/v1/subscriptions/{id}/change-plan/preview \
  --header 'Content-Type: application/json' \
  --header 'x-api-key: <api-key>' \
  --data '
{
  "planId": "<string>",
  "items": [
    {
      "priceVersionId": "<string>",
      "quantity": 1
    }
  ],
  "itemOverrides": {},
  "prorationBehavior": "create_prorations"
}
'

const options = {
  method: 'POST',
  headers: {'x-api-key': '<api-key>', 'Content-Type': 'application/json'},
  body: JSON.stringify({
    planId: '<string>',
    items: [{priceVersionId: '<string>', quantity: 1}],
    itemOverrides: {},
    prorationBehavior: 'create_prorations'
  })
};

fetch('https://api.sandbox.z2pay.com/v1/subscriptions/{id}/change-plan/preview', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

import requests

url = "https://api.sandbox.z2pay.com/v1/subscriptions/{id}/change-plan/preview"

payload = {
    "planId": "<string>",
    "items": [
        {
            "priceVersionId": "<string>",
            "quantity": 1
        }
    ],
    "itemOverrides": {},
    "prorationBehavior": "create_prorations"
}
headers = {
    "x-api-key": "<api-key>",
    "Content-Type": "application/json"
}

response = requests.post(url, json=payload, headers=headers)

print(response.text)

{
  "error": {
    "code": "VALIDATION_ERROR",
    "message": "Validation failed",
    "issues": [
      {
        "path": "status",
        "message": "Status inválido. Valores aceitos: pending, waiting_payment, paid, refused, canceled, refunded"
      },
      {
        "path": "startDate",
        "message": "Data deve ser ISO 8601 com timezone (ex.: 2026-06-24T00:00:00Z)"
      }
    ]
  }
}

{
  "error": {
    "code": "UNAUTHORIZED",
    "message": "Invalid API key"
  }
}

{
  "error": {
    "code": "NOT_FOUND",
    "message": "Resource not found"
  }
}

{
  "error": {
    "code": "CONFLICT",
    "message": "No refundable payment found"
  }
}