Hi, I am currently struggling with a similar error. Where did you add this piece of code in the php-sdk? Currenly the only thing I have added to my code is my API key and Access Key. When I add the API Key and Acess Key, and run the addOrUpdateContact.php I get the following error: Array
 => Array
[error_key] => json.type.invalid
[error_message] => #/lists/0/id: Value is of a disallowed type. Allowed types are: String.
) Any ideas how to address this error? I have attached my code, if you look in addOrUpdateContact.php, I have added my keys, that is the only thing I have changed in it. Would really appreciate your help. Best, Mohamad
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