getPublisherInfo

 private fun getPublisherInfo(subscriptionCallback: Callback<Subscription>) {

        td?.let {
            val subscription    = subscriptionInstance.subscriptionExpiresOn(it.purchaseInfo.purchaseData.purchaseToken)
            subscription.enqueue(subscriptionCallback)
        }
    }

fun updateExpirationDate(){
        if (isPremium()) {

            val saveEndDate = getEndDateSaved()
            if ((saveEndDate != null && getRemainingDays() < 0) || saveEndDate == null ) {
                //need to get the expire date

                td?.purchaseInfo?.purchaseData?.purchaseToken?.let { token ->
                    getPublisherInfo( token, subscriptionCallback )
                }

                getPublisherInfo(object : Callback<Subscription> {
                    override fun onResponse(call: Call<Subscription>, response: Response<Subscription>) {

                        val b = response.body() ?: return
                        val expireDate = Date(b.expiryTimeMillis)

                        StorageUtils.writePremiumEndDate(ctx, expireDate)
                        Log.d(TAG, "Subscription date : " + expireDate)
                    }

                    override fun onFailure(call: Call<Subscription>, t: Throwable) {
                        Log.e(TAG, "e : " + t.localizedMessage)
                    }
                })
            }
        }
    }