intercom.conversations.reply(
type="admin",
subject=subject,
id=convo_id,
message_type='inapp',
email="iaaa@test.com",
body=message,
admin_id=INTERCOM_ADMIN_ID
)

Error:
File "/home/goose/miniconda3/envs/venv/lib/python3.7/site-packages/intercom/service/conversation.py", line 32, in reply
return self.__reply(reply_data)
File "/home/goose/miniconda3/envs/venv/lib/python3.7/site-packages/intercom/service/conversation.py", line 62, in __reply
response = self.client.post(self.resource_url(_id), reply_data)
File "/home/goose/miniconda3/envs/venv/lib/python3.7/site-packages/intercom/client.py", line 96, in post
return self._execute_request(req, params)
File "/home/goose/miniconda3/envs/venv/lib/python3.7/site-packages/intercom/client.py", line 84, in _execute_request
result = request.execute(self.base_url, self._auth, params)
File "/home/goose/miniconda3/envs/venv/lib/python3.7/site-packages/intercom/request.py", line 36, in execute
return self.send_request_to_path(base_url, auth, params)
File "/home/goose/miniconda3/envs/venv/lib/python3.7/site-packages/intercom/request.py", line 84, in send_request_to_path
parsed_body = self.parse_body(resp)
File "/home/goose/miniconda3/envs/venv/lib/python3.7/site-packages/intercom/request.py", line 98, in parse_body
self.raise_application_errors_on_failure(body, resp.status_code) # noqa
File "/home/goose/miniconda3/envs/venv/lib/python3.7/site-packages/intercom/request.py", line 154, in raise_application_errors_on_failure
raise error_class(message, error_context)
intercom.errors.BadRequestError: Type can't be nil

If I remove type:
File "/home/goose/miniconda3/envs/venv/lib/python3.7/site-packages/intercom/service/conversation.py", line 32, in reply
return self.__reply(reply_data)
File "/home/goose/miniconda3/envs/venv/lib/python3.7/site-packages/intercom/service/conversation.py", line 62, in __reply
response = self.client.post(self.resource_url(_id), reply_data)
File "/home/goose/miniconda3/envs/venv/lib/python3.7/site-packages/intercom/client.py", line 96, in post
return self._execute_request(req, params)
File "/home/goose/miniconda3/envs/venv/lib/python3.7/site-packages/intercom/client.py", line 84, in _execute_request
result = request.execute(self.base_url, self._auth, params)
File "/home/goose/miniconda3/envs/venv/lib/python3.7/site-packages/intercom/request.py", line 36, in execute
return self.send_request_to_path(base_url, auth, params)
File "/home/goose/miniconda3/envs/venv/lib/python3.7/site-packages/intercom/request.py", line 84, in send_request_to_path
parsed_body = self.parse_body(resp)
File "/home/goose/miniconda3/envs/venv/lib/python3.7/site-packages/intercom/request.py", line 98, in parse_body
self.raise_application_errors_on_failure(body, resp.status_code) # noqa
File "/home/goose/miniconda3/envs/venv/lib/python3.7/site-packages/intercom/request.py", line 154, in raise_application_errors_on_failure
raise error_class(message, error_context)
intercom.errors.BadRequestError: Type can't be nil

I think there is nothing wrong with the library, the API must have change. Documentation states that type is required. https://developers.intercom.com/intercom-api-reference/reference#replying-to-a-conversation