When trying to do foreach ($zendesk->helpCenter->sections()->iterator() as $section) I get the error

 Zendesk\API\Exceptions\ApiResponseException Client error: `GET https://<subdomain>.zendesk.com/api/v2/help_center/sections.json?page%5Bsize%5D=100&page%5Bafter%5D=aQQAAAAAAAAAZFh7/mcAAAAAaR13Wko+GAAA` resulted in a `400 Bad Request` response:
{"errors":[{"code":"InvalidPaginationParameter","title":"Invalid cursor"}]}
 [details] {"errors":[{"code":"InvalidPaginationParameter","title":"Invalid cursor"}]}.

If I urlencode the page[after] value I get a working response. Or adding urlencode on this line

This is likely a more widespread problem, so might want to look at encoding all query params sent to Zendesk\API\HttpClient::get, but that would be a breaking change since that is a public method.

An entirely different approach would be to use the meta.next value in the response instead of the meta.after value.