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Function used to set the default key. If included, then key arguments in FRED API calls are no longer needed. API keys can be requested at https://fred.stlouisfed.org/docs/api/api_key.html.
key
set_fred_key(key)
32 character lower-cased alpha-numeric character string
NULL
# NOT RUN { set_fred_key("abcdefghijklmnopqrstuvwxyz123456") # }
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