Chains API

**Endpoint: ** `/external/api/chains/message`
 **Method: ** `POST`
 **Description: ** This endpoint allows users to send a message to a specified chain through the BotConnect API.
 **Request Body: **
 ```json
 {
 "chain": "chainName",
 "message": "query message",
 "user": {
 "username": "username",
 "displayName": "DisplayName",
 "email": "user@hcl.com"
 },
 "source": "web"
 }
 ```
The following are the terms used with the chains API:
  • Chain: The name of the chain to which the message will be sent.
  • Message: The query message to be sent to the chain.
  • User: Information about the user sending the message.
  • Username: The username of the user.
  • DisplayName: The display name of the user.
  • Email: The email address of the user.
  • Source: The source from which the message is being sent (e.g., "web").