Simply invoke the "generate" script with the name of the desired repo, a folder to output the client folder into, and an optional URL for the OpenAPI documentation (defaults to http://localhost:3000/documentation/json):
./generator issuer-phone-twilio /my/packages
# or
./generator issuer-phone-twilio /my/packages http://localhost:3000/documentation/json
The FORCE_OVERWRITE env var can also be specified to force overwriting an existing package.