how to use REST API json PUSH to change data?

i’m using the following code, the wsse header is fine, but how to update the data?
Whatever i try as format for the $data array, i keep getting:

[{“title”:”extra fields constraint”,”detail”:”This form should not contain extra fields: \”{\”email\”:\”test@doens_nl\”}\””}]

PHP

$apicall = "leademails/1"; // update e-mail with id 1. $dataUpdate = array ( 'email' => 'test@doens.nl' ); $ch = curl_init(); curl_setopt($ch, CURLOPT_URL, $url.$apicall); curl_setopt($ch, CURLOPT_CUSTOMREQUEST, 'PATCH'); //LET OP!! PATCH voor updates!! //curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1); //voorkomt output als echo curl_setopt($ch, CURLOPT_HTTPHEADER, wsseheader($userName, $userPassword)); curl_setopt($ch, CURLOPT_POSTFIELDS, json_encode($dataUpdate)); $data = curl_exec($ch); $httpcode = curl_getinfo($ch, CURLINFO_HTTP_CODE);

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$apicall = "leademails/1"; // update e-mail with id 1. $dataUpdate = array (     'email' => 'test@doens.nl'  ); $ch = curl_init(); curl_setopt($ch, CURLOPT_URL, $url.$apicall); curl_setopt($ch, CURLOPT_CUSTOMREQUEST, 'PATCH'); //LET OP!! PATCH voor updates!! //curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1); //voorkomt output als echo curl_setopt($ch, CURLOPT_HTTPHEADER, wsseheader($userName, $userPassword)); curl_setopt($ch, CURLOPT_POSTFIELDS, json_encode($dataUpdate)); $data = curl_exec($ch); $httpcode = curl_getinfo($ch, CURLINFO_HTTP_CODE);

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