I send a request to /oauth/token but get the Invalid Grant error.
$response = $client->request('POST', '/oauth/token', [
"headers" => [
"Authorization" => "Basic ". base64_encode('Client ID'.':'.'Client secret')
],
'form_params' => [
"grant_type" => "authorization_code",
"code" => $request['code'],
"redirect_uri" => 'my link'
],
]);
I used the Development credentials
Help me