Setup & implement graphql subscription on a multiple chat api. A user can initiate a multiple chat & should obtain real time updates on all replies. The businesses that replies can only view their conversation that initiated the chat.
Add MQ definite delivery of a calling rest api. Read from the MQ (Message Queue) api and process accordingly. The project is enabled for graphql and restful api's. Will provide all requirements in a documentation if you a successfully selected freelancer.