public func CreateExternalAccountKey(req: CreateExternalAccountKeyRequest) async throws -> ExternalAccountKey {
    let query = [
      URLQueryItem(name: "$alt", value: "json")
    ]
    var request = try await self.inner.Request(path: "/v1/\(req.parent)/externalAccountKeys", query: query)
    request.httpMethod = "POST"
    if let body = req.externalAccountKey {
      request.setValue("application/json", forHTTPHeaderField: "Content-Type")
      request.httpBody = try JSONEncoder().encode(body)
    }
    let (data, response) = try await self.inner.data(for: request)
    if !(200..<300).contains(response.statusCode) {
      throw RequestError.http(HTTPDetails(
        http_status_code: response.statusCode,
        headers: [:],
        payload: data,
      ))
    }
    let decodedResponse = try JSONDecoder().decode(ExternalAccountKey.self, from: data)
    return decodedResponse
  }