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Determines if Leanpub API Key is set. If not, it stops and returns an error. If so, returns the value.
lp_api_key(api_key = NULL, error = TRUE)lp_have_api_key(api_key = NULL)
lp_have_api_key(api_key = NULL)
Character API key
Leanpub API key (Sys.getenv('LEANPUB_API_KEY'))
Sys.getenv('LEANPUB_API_KEY')
Should the function error if api_key = NULL?
api_key = NULL
res = lp_api_key(error = FALSE) lp_have_api_key()
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