Problem: access "studies" endpoint fails, but used to work. Error messages for as_list TRUE and FALSE are shown.

prolific_api_access <- api_access(api_token = Sys.getenv('token'))

access(
prolific_api_access,
endpoint = "studies",
method = "get",
as_list = TRUE
)

Warning: Some columns are a multi-column type (such as a matrix column): [7]. setDT will retain these columns as-is but subsequent operations like grouping and joining may fail. Please consider as.data.table() instead which will create a new column for each embedded column.Error in data.table::setDT(output) :
All elements in argument 'x' to 'setDT' must be of same length, but the profile of input lengths (length:frequency) is: [2:1, 76:14]
The first entry with fewer than 76 entries is 7

access(
prolific_api_access,
endpoint = "studies",
method = "get",
as_list = FALSE
)

Error in output$results : $ operator is invalid for atomic vectors

One of my main use cases for the package was to be able to download the participants' demographic data into R. It would be great to add an example of how to do this to a vignette. I figured it out from the API documentation. This is the approach I used:

api <- api_access(api_token = "<your_api_token>")
demo <- api$access(
  endpoint = c("studies", "<your_study_id>", "export"),
  method = "get"
)
demo_df <- read.csv(text = demo)

I loaded the prolific.api package and used api_access(api_token = "X") where X is the API token generated on my workspace Settings page. I get back the error "API token status: invalid API access failed!". Am I doing something wrong, or has the API changed?