curl --request POST \
  --url https://api.unibee.dev/merchant/subscription/config/update \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "downgradeEffectImmediately": true,
  "downgradeNonImmediatelyEffectBeforePeriodEnd": 123,
  "gatewayVATRule": [
    {
      "gatewayNames": "<string>",
      "ignoreVatNumber": true,
      "taxPercentage": 123,
      "validCountryCodes": "<string>"
    }
  ],
  "incompleteExpireTime": 123,
  "invoiceEmail": true,
  "showZeroInvoice": true,
  "tryAutomaticPaymentBeforePeriodEnd": 123,
  "upgradeProration": true
}
'

{
  "code": 123,
  "data": {
    "config": {
      "downgradeEffectImmediately": true,
      "downgradeNonImmediatelyEffectBeforePeriodEnd": 123,
      "fiatExchangeApiKey": "<string>",
      "gatewayVATRule": "<string>",
      "incompleteExpireTime": 123,
      "invoiceEmail": true,
      "invoicePdfGenerate": true,
      "showZeroInvoice": true,
      "tryAutomaticPaymentBeforePeriodEnd": 123,
      "upgradeProration": true
    }
  },
  "merchantId": 123,
  "message": "<string>",
  "redirect": "<string>",
  "requestId": "<string>"
}