PaymentActivity.kt

class PaymentActivity : AppCompatActivity() {

    private val builder = PayUmoneySdkInitializer.PaymentParam.Builder()
    var paymentParam: PayUmoneySdkInitializer.PaymentParam? = null
    val merchantID = "6392590"

    private fun startPay(
        amount: String, txnid: String, phoneNumber: String,
        productinfo: String, name: String, email: String, udf1: String, udf2: String,
        udf3: String, udf4: String, udf5: String
    ) {

        builder.setAmount(amount)
            .setTxnId(txnid)
            .setPhone(phoneNumber)
            .setProductName(productinfo)
            .setFirstName(name)
            .setEmail(email)
            .setsUrl("https://www.payumoney.com/mobileapp/payumoney/success.php")
            .setfUrl("https://www.payumoney.com/mobileapp/payumoney/failure.php")
            .setUdf1(udf1)
            .setUdf2(udf2)
            .setUdf3(udf3)
            .setUdf4(udf4)
            .setUdf5(udf5)
            .setUdf6("")
            .setUdf7("")
            .setUdf8("")
            .setUdf9("")
            .setUdf10("")
            .setIsDebug(BuildConfig.DEBUG)
            .setKey(key)
            .setMerchantId(merchantID)

        paymentParam = builder.build()
        val call = getService().getHash(
            txnid, productinfo, amount, name, email,
            udf1, udf2, udf3, udf4, udf5
        )

        call.enqueue(object : Callback<JsonObject> {
            override fun onFailure(call: Call<JsonObject>, t: Throwable) {
                log(E, "Failed getting hash from server ${t.message}")
            }

            override fun onResponse(
                call: Call<JsonObject>,
                response: Response<JsonObject>
            ) {
                val responseBody = response.body().toString()
                try {
                    val jsonObject = JSONObject(responseBody)
                    val hash: String = jsonObject.get("hash").toString()
                    paymentParam?.setMerchantHash(hash)
                    PayUmoneyFlowManager.startPayUMoneyFlow(
                        paymentParam,
                        this@PaymentActivity, R.style.PaymentAppTheme, false
                    )

                } catch (e: JSONException) {
                    log(E, "error parsing json: ${e.message}")
                }
            }
        })

    }

}