refreshToken method
Refreshes an Access Token issuing a refresh_token grant to the OAuth2 server.
Implementation
Future<AccessTokenResponse> refreshToken(String refreshToken,
{httpClient, required String clientId, String? clientSecret}) async {
final Map params = getRefreshUrlParams(refreshToken: refreshToken);
var response = await _performAuthorizedRequest(
url: _getRefreshUrl(),
clientId: clientId,
clientSecret: clientSecret,
params: params,
httpClient: httpClient);
return http2TokenResponse(response);
}