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Following is the curl call to refresh access token if it is expired. Thanks to Brady Fausett.

1. Token Refresh CURL Example:BB_SERVER="<BB2 sandbox or prod URL>"
2. BB_CLIENT_ID="<your app's client ID>"
3. BB_CLIENT_SECRET="<your app's client SECRET>"REFRESH_TOKEN="<your refresh token associated with a previously granted access token>"curl -s -w # # "% {http_code}" -X POST "${BB_SERVER}/v1/o/token/" \
   1. -u "${BB_CLIENT_ID}:${BB_CLIENT_SECRET}" \
   2. -d "grant_type=refresh_token&client_id=${BB_CLIENT_ID}&refresh_token=${REFRESH_TOKEN}"EXAMPLE RETURN FROM CURL COMMAND: {"access_token": # "wlRtbVkXzUdE9Kcjc8wWnpRmJ7KuuC", "expires_in": 36000, "token_type": "Bearer", "scope": "patient/ExplanationOfBenefit.read patient/Coverage.read", "refresh_token": "gzKxj0JkKamuaOWZRaIAJyfL3e9CZW", "patient": "-19990000000003"}200