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Note the below examples are just for guidance - you are free to use any JWT library you are comfortable with or which your frameworks support. As you can see on the official JWT site - there are plenty of available libraries for each possible language.
The Java example is using the popular open source java-jwt library.
The PHP example doesn't use external libraries, so it is a little bit more verbose.
Java
PHP
String developerKey = "YOUR_DEVELOPER_KEY_FROM_THE_DASHBOARD";
String teamId = "YOUR_TEAM_ID_FROM_THE_DASHBOARD";
String roomId = "YOUR_ROOM_NAME_OR_ROOM_ID";
String username = "John Smith";
Algorithm algorithm = Algorithm.HMAC256(developerKey);
String token = JWT.create()
.withClaim("td", teamId)
.withClaim("rd", roomId)
.withClaim("u", username)
//.withClaim("ud", "ABC1234567254435")
//.withClaim("role", "moderator")
//.withIssuedAt(new Date())
//.withNotBefore(new Date(System.currentTimeMillis() + 3600000))
//.withExpiresAt(new Date(System.currentTimeMillis() + (3600000 * 2)))
.sign(algorithm);
$developerKey = 'YOUR_DEVELOPER_KEY_FROM_THE_DASHBOARD';
$teamId = 'YOUR_TEAM_ID_FROM_THE_DASHBOARD';
$roomId = 'YOUR_ROOM_NAME_OR_ID';
$username = 'John Smith';
// Create token header as a JSON string
$header = json_encode(['typ' => 'JWT', 'alg' => 'HS256']);
// Create token payload as a JSON string
$payload = json_encode([
'td' => $teamId,
'rd' => $roomId,
'u' => ''.$username.'',
'role' => 'moderator'
]);
// Encode Header to Base64Url String
$base64UrlHeader = str_replace(['+', '/', '='], ['-', '_', ''], base64_encode($header));
// Encode Payload to Base64Url String
$base64UrlPayload = str_replace(['+', '/', '='], ['-', '_', ''], base64_encode($payload));
// Create Signature Hash
$signature = hash_hmac('sha256', $base64UrlHeader . "." . $base64UrlPayload, $developerKey, true);
// Encode Signature to Base64Url String
$base64UrlSignature = str_replace(['+', '/', '='], ['-', '_', ''], base64_encode($signature));
$token = $base64UrlHeader . "." . $base64UrlPayload . "." . $base64UrlSignature;