curl --request GET \
  --url https://api.dooki.com.br/v2/{alias}/checkout/gateways/{gatewayAlias} \
  --header 'User-Secret-Key: <api-key>' \
  --header 'User-Token: <api-key>'

{
  "data": {
    "alias": "billet",
    "name": "Boleto Bancário",
    "icon_url": "<string>",
    "allow_backup": true,
    "installments_config": {
      "allow_custom_installments": true,
      "message": "<string>",
      "help_link": "<string>"
    },
    "auth_type": "Boleto Bancário",
    "gateway_exists": true,
    "params": {
      "data": [
        [
          "env",
          "merchant_id",
          "key"
        ]
      ]
    }
  }
}