private fun getReferralId() {

    Firebase.dynamicLinks

        .getDynamicLink(intent)

        .addOnSuccessListener(this) { pendingDynamicLinkData: PendingDynamicLinkData? ->

            pendingDynamicLinkData?.link?.getQueryParameter(

                DEEP_LINK_QUERY_PARAM_REFERRAL_ID

            )?.let { refId ->

                viewModel.saveReferralId(refId)

            }

        }

 }