lists

Array
(
    [type] => https://mailchimp.com/developer/marketing/docs/errors/
    [title] => API Key Invalid
    [status] => 401
    [detail] => Your API key may be invalid, or you've attempted to access the wrong datacenter.
    [instance] => c8f1e507-534f-c2f7-3f38-70711509dc46
)

last request
Array ( [method] => get [path] => lists [url] => https://us19.api.mailchimp.com/3.0/lists [body] => [timeout] => 10 [headers] => GET /3.0/lists? HTTP/2 Host: us19.api.mailchimp.com user-agent: DrewM/MailChimp-API/3.0 (github.com/drewm/mailchimp-api) accept-encoding: deflate, gzip, br accept: application/vnd.api+json content-type: application/vnd.api+json authorization: apikey 23f179bf561b0f47cb09f190474a961a-us19 )