useReferralCode method

Implementation

void useReferralCode() {
  final referralCode = Requests.box.read('refCode') as String?;
  if (referralCode == null || referralCode.isEmpty) {
    autoFillReferralCode.value = false;
  } else {
    referralCodeTxtController.text = referralCode;
    autoFillReferralCode.value = true;
    Preferences.clearRefCode();
  }
}