How to add my Api key into get_map() function?

I'm trying to add my api key into get_map function, because otherwise it will occur "HTTP status was '403 Forbidden'" error. I tried to assign api_key <- 'my api key' , but seems it doesn't work....

Here is my mapping code: <- ggmap(get_map("Dayton",
zoom = 13, scale = "auto",
maptype = "satellite",
source = "google",

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