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How can I update port to environment variable, as this is required to deploy on heroku?

1

**Describe the bug/problem** I want to test to deploy the app to heroku. Heroku required to set port number as their environment varible which cannot be hardcoded and its random....

Confuse in "Setup the Bot"

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Do I need to "create an environmental variable" and is "for local development" means OPTIONAL? If this step is not optional but essential, how to done the step "config var...