how i can use package ggmap

how i can use get_googlemap() function after getting API? any simple example

requires Google API key, see ?register_google

## basic usage
########################################

(map <- get_googlemap(c(-97.14667, 31.5493)))
ggmap(map)

source:https://www.rdocumentation.org/packages/ggmap/versions/3.0.0/topics/get_googlemap

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