Issues with maintaining conversation thread using OpenAI API in ManyChat: authentication fails after first response

API
1

Hello everyone

I’m having difficulty using the OpenAI Assistants API in my ManyChat setup for handling multi-turn conversations. The chatbot responds correctly to the first question but fails when trying to process the second and subsequent questions.

Here’s a summary of the current flow:

  1. First Webhook: A POST request to https://api.openai.com/v1/threads/runs
  • Headers:
    • OpenAI-Beta: assistants=v2
    • Content-Type: application/json
    • Authorization: Bearer {{Bot Field OpenAI API}}
  • Request Body:
{
  "assistant_id": "{{Bot Field Asistente}}",
  "thread": {
    "messages": [
      {"role": "user", "content": "Pregunta ChatGPT"}
    ]
  }
}
  • Response Mapping: Maps the thread_id to the user field GPT thread to save the thread ID.
  1. Second Webhook: A GET request to https://api.openai.com/v1/threads/'GPT thread'/messages
  • Headers:
    • OpenAI-Beta: assistants=v2
    • Content-Type: application/json
    • Authorization: Bearer {{Bot Field OpenAI API}}
  • Response Mapping: Maps the returned message content to the user field Respuesta ChatGPT.
  1. Third Webhook: A POST request to https://api.openai.com/v1/threads/'GPT thread'/messages
  • Headers:
    • OpenAI-Beta: assistants=v2
    • Content-Type: application/json
    • Authorization: Bearer {{Bot Field OpenAI API}}
  • Request Body:
{
  "role": "user",
  "content": "{{Pregunta ChatGPT}}"
}
  1. Fourth Webhook: A POST request to https://api.openai.com/v1/threads/'GPT thread'/runs
  • Headers:
    • OpenAI-Beta: assistants=v2
    • Content-Type: application/json
    • Authorization: Bearer {{Bot Field OpenAI API}}

The flow works well for the first message, but as soon as the second question is asked, the bot fails to return a response. The error logs show issues such as “Unauthorized” or “Invalid Request,” especially when the second POST request to the threads/runs endpoint is made.

This chatbot is crucial for me, and I’m struggling to make it work. I’m not a programmer or developer. I’m 46 years old, and I was let go from my job, where I worked for 20 years, a year and a half ago. I found “help” in ManyChat forums offering to sell me a solution for USD 350, but I can’t afford that. I really need to make this chatbot work and would deeply appreciate any guidance to resolve this issue.