Sets the user credentials for the AQS API. This function
needs to be called once and only once every time this library
is re-loaded. Users must have a valid username and key which
can be obtained through the use of the aqs_sign_up function,
Use
aqs_sign_up() to sign up for AQS datamart
credentials.
Value
NULL (invisible) This functions is called for its side effect and does not return meaningful data.
Examples
#to authenticate an existing user the email address
# 'John.Doe@myemail.com' and key = 'MyKey'
# after calling this function please follow the instructions that are sent
# in the verification e-mail before proceeding.
if (FALSE) aqs_credentials(username = 'John.Doe@myemail.com',
key = 'MyKey')
# \dontrun{}