code: def create_issue(self, project_id, summary, issue_type_id, priority_id, extra_request_params={}):
          
          request_params = extra_request_params
          request_params["projectId"] = project_id
          request_params["summary"] = summary
          request_params["issueTypeId"] = issue_type_id
          request_params["priorityId"] = priority_id
  
          return self.do("POST", "issues",
                         request_params=request_params,
                         )
docs: client = BacklogClient("your_space_name", "your_api_key")
          project_key = "YOUR_PROJECT"
  
          project_id = client.get_project_id(project_key)
          issue_type_id = client.project_issue_types(project_key)[0][u"id"]
          priority_id = client.priorities()[0][u"id"]
  
          client.create_issue(project_id,
                              u"some summary",
                              issue_type_id,
                              priority_id,
                              {"description": u"a is b and c or d."})