Thank you so much for your answer, Dave. Removing the square brackets does get it executed by your API test page, but I'm still having trouble getting it to run from PHP. And this may be something I am doing wrong, so if you still have time, it would be an enourmous help if you could glance over my code: $Request = curl_init( $Url ); curl_setopt( $Request, CURLOPT_RETURNTRANSFER, TRUE ); curl_setopt( $Request, CURLOPT_SSL_VERIFYHOST, FALSE ); curl_setopt( $Request, CURLOPT_SSL_VERIFYPEER, FALSE ); curl_setopt( $Request, CURLOPT_TIMEOUT, 10 ); $RequestJson = json_encode( $RequestData ); // $RequestData is array curl_setopt( $Request, CURLOPT_HTTPHEADER, array( 'Content-Length: ' . strlen( $RequestJson) ) ); curl_setopt( $Request, CURLOPT_POSTFIELDS, $RequestJson ); $Response = curl_exec( $Request ); // end of code the $RequestJson looks like this: {"first_name":"One","last_name":"Two","lists":[{"id":"1"}],"email_addresses":[{"email_address":"one@two.com"}]} bud I get: "[{"error_key":"http.header.content_type.invalid","error_message":"Invalid content type. API only supports application/json."}]
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