Use this script to connect your ChatFuel bot to DialogFlow.

Create a JSON API card in ChatFuel and paste the endpoint link in (ie. in the default response block or somewhere useful).

Pass the queryString user attribute which can be set beforehand with "Setup user attribute" and {{ last user freeform input }} or a "User input" with no message to user.

Create an environment variable in RunKit called API_AI_KEY with your DialogFlow "client access token" as the value. It will look like this 86a437d748aa4a8aca126487efafe427.

Then DialogFlow will send back text responses and any custom payloads as documented in the ChatFuel JSON docs.

See this on RunKit.