Returns you token set by wf_set_key
wf_get_key(user, service = "webapi")
user (email address) used to sign up for the ECMWF data service
which service to use, one of webapi
, cds
or ads
(default = webapi)
the key set using wf_set_key
saved
in the keychain
if (FALSE) {
# set key
wf_set_key(user = "test@mail.com", key = "123")
# get key
wf_get_key(user = "test@mail.com")
}