Voiceflow + Facebook Messenger Chatbot Integration Issues

Hello,

I'm attempting to connect a Voiceflow AI Chatbot to Facebook Messenger.

My automation consists of three modules:

1. Webhook: This module captures data from Facebook when a new message is received.
2. HTTP API call: This module sends the Facebook message to Voiceflow and retrieves an AI-generated response.
3. Webhook Response: This module is intended to send the AI response back to the Facebook API.

I've successfully configured the first two steps, and the data is being processed correctly.

However, I'm struggling to figure out how to send the response back to Facebook, even though the third module appears to be functioning as expected.

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I've experimented with various code configurations in the final module. This includes placing the URL, PAGE ID, and other details in the Header section with minimal code in the Body, as well as consolidating everything into the Body (as shown below). Despite these attempts, I haven't been able to get Facebook Messenger to display any output.

At this point, I'm uncertain if the Webhook Response module is the appropriate tool for this task.

Does anyone have experience with Facebook Messenger bots?
Is this achievable with callin.io?

All the Voiceflow tutorials for hosting a webhook like this for a bot utilized Ngrok on Replit, which is a bit beyond my current expertise. Thanks for any assistance.

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