getApiToken method
Implementation
Future<String> getApiToken() async {
bearerToken = sharedPreferences.getString(Constant.API_TOKEN) ?? "";
bearerTokenExpirationDate = sharedPreferences.getString(Constant.API_TOKEN_EXPIRATION_DATE) ?? "";
logCat('getApiToken() | bearerToken: $bearerToken | bearerTokenExpirationDate: $bearerTokenExpirationDate');
updateHeader();
return bearerToken;
}