List product variants

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    {
      "id": "var_0a1b2c3d4e5f60718293",
      "productId": "prd_0a1b2c3d4e5f60718293",
      "name": "Acme Ltda",
      "slug": "string",
      "description": "string",
      "sku": "string",
      "primary": true,
      "enabled": true,
      "pricing": {
        "oldPrice": 5000,
        "unitPrice": 5000,
        "costPerItem": 0,
        "currency": "BRL",
        "schema": "unit",
        "type": "oneTime",
        "daysTrial": 0,
        "billingType": "string",
        "billingFrequency": "string",
        "billingFrequencyCount": 0,
        "billingExactDay": 0,
        "cycles": 0,
        "trialInterval": "string",
        "trialIntervalCount": 0,
        "tiersMode": "string",
        "usageType": "string",
        "usageAggregation": "string",
        "meterEventName": "string"
      },
      "images": [
        "string"
      ],
      "metadata": {},
      "attributes": {},
      "externalReference": "string",
      "checkoutUrl": "string",
      "createdAt": "string",
      "updatedAt": "string"
    }
  ],
  "hasMore": true
}

{
  "error": {
    "status": "Unauthorized",
    "statusCode": 401,
    "category": "authentication",
    "code": "unauthorized",
    "message": "Authentication is required to access this resource.",
    "resource": "server"
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{
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    "code": "forbidden",
    "message": "You do not have permission to perform this action.",
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{
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    "status": "Internal Server Error",
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    "message": "An unexpected error occurred.",
    "resource": "server"
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{
  "error": {
    "status": "Internal Server Error",
    "statusCode": 500,
    "category": "server",
    "code": "serverError",
    "message": "An unexpected error occurred. Please try again later.",
    "resource": "server",
    "details": "If the problem persists, contact support with the correlationId from the response headers."
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}