Is there a way an API key can be used to get a basemap for a map on ggplot? I’ve got a Thunderforest API key and want to use the “landscape” layer with a zoom level of 15. Looks like zoom 14 and beyond has the “API required” watermark.

I’ve followed through the code and answer here: How to pass Thunderforest API key to the R ggspatial package to create a map but I get an error when I run:

thunderforest = source_from_url_format(
  url_format = c('http://a.tile.thunderforest.com/landscape/${z}/${x}/${y}.png?apikey=<my_api>',
                 'http://b.tile.thunderforest.com/landscape/${z}/${x}/${y}.png?apikey=<my_api>',
                 'http://c.tile.thunderforest.com/landscape/${z}/${x}/${y}.png?apikey=<my_api>'),
)

I get the following error:

Error in match.arg(extension, c("png", "jpeg", "jpg")) : 
  'arg' should be one of “png”, “jpeg”, “jpg”

And yes I replaced <my_api> with my actual API

For reference, this is an example of the map I am trying to make

library(tidyverse)
library(sf)
library(ggspatial)


tibble(
  lat = 148.652, 
  lon = -35.600
) %>% 
  st_as_sf(
    x = ., 
    crs = 4326, 
    coords = c('lat', 'lon')
  ) %>% 
  {. ->> my_point}


ggplot()+
  geom_sf(data = my_point)+
  annotation_map_tile(alpha = 0.7, type = 'thunderforestlandscape', zoom = 16)+
  coord_sf(
    xlim = c(148.64, 148.66), 
    ylim = c(-35.61, -35.59)
  )

And the current output has the “API required” watermark.