获取费率卡

{
  "requestBody": {},
  "responses": {
    "200": {
      "description": "Rate card",
      "content": {
        "application/json": {
          "$ref": "#/components/schemas/RateCardResponse"
        }
      }
    },
    "400": {
      "description": "Invalid request",
      "content": {
        "application/json": {
          "$ref": "#/components/schemas/RequestError"
        }
      }
    },
    "401": {
      "description": "Authentication required or invalid",
      "content": {
        "application/json": {
          "$ref": "#/components/schemas/SecurityError"
        }
      }
    },
    "403": {
      "description": "Authenticated but not permitted",
      "content": {
        "application/json": {
          "$ref": "#/components/schemas/SecurityError"
        }
      }
    },
    "429": {
      "description": "Rate limit exceeded",
      "content": {
        "application/json": {
          "$ref": "#/components/schemas/SecurityError"
        }
      }
    },
    "500": {
      "description": "Unexpected server error",
      "content": {
        "application/json": {
          "$ref": "#/components/schemas/ApiError"
        }
      }
    }
  }
}