I am working to integrate Zoho Books into myapp (free trial).

Please find below the different steps:

Step 1 (ok) : Registering New Client (to get Client ID and Client Secret)

Step 2   (ok)   : Generating Grant Token

Step 3 (ok): Generate Access and Refresh Token 

Step 4 (ok): Generate Access Token From Refresh Token

Step 6 (KO Erreur): Calling An API

{"code":14,"message":"Invalid value passed for authtoken."}

$res = $this->curlPost( 'https://books.zoho.eu/api/v3/organizations', NULL, ['Authorization'=>'Zoho-authtoken '.$accessTokenObjZoho]);

function curlPost($url, $data=NULL, $headers = NULL) {

$ch = curl_init($url);

curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);

if(!empty($data)){

curl_setopt($ch, CURLOPT_POSTFIELDS, $data);

}

if (!empty($headers)) {

curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);

}

$response = curl_exec($ch);

if (curl_error($ch)) {

curl_close($ch);

trigger_error('Curl Error:' . curl_error($ch));

}

curl_close($ch);

return $response;

}

$accessTokenObjZoho = it contains a value generated by refreshtoken

(Format : xxxx.xxxae0xxx5f3f3exxx941d0axxxx3xxd.xxxe7099exxx7xxxx3xxxe1e909xxxxx)

the problem that in https://accounts.zoho.eu, it is mentioned "You do not have any active secret auth tokens".

How to resolve this error " Invalid value passed for authtoken."

And an other question , please, in the authentication step, how can the customer select the desired organization?