Using this with correct campaign_id and url $result = $MailChimp->put("campaigns/$campaign_id/content", [ 'url' => $url ]); results always in: "Resource Not Found,404,The requested resource could not be found." ?
Using this with correct campaign_id and url
$result = $MailChimp->put("campaigns/$campaign_id/content", [
'url' => $url
]);
results always in:
"Resource Not Found,404,The requested resource could not be found."
?