diff --git a/app/src/main/java/sh/sar/gridflow/PayWithoutAccountActivity.kt b/app/src/main/java/sh/sar/gridflow/PayWithoutAccountActivity.kt
index 7b631e5..c6ff11b 100644
--- a/app/src/main/java/sh/sar/gridflow/PayWithoutAccountActivity.kt
+++ b/app/src/main/java/sh/sar/gridflow/PayWithoutAccountActivity.kt
@@ -129,8 +129,13 @@ class PayWithoutAccountActivity : AppCompatActivity() {
             if (bill.status == "paid") {
                 Toast.makeText(this, "This bill has already been paid", Toast.LENGTH_SHORT).show()
             } else {
-                // TODO: Navigate to payment flow
-                Toast.makeText(this, "Payment flow coming soon", Toast.LENGTH_SHORT).show()
+                // Navigate to PaymentReviewActivity for single bill
+                val intent = android.content.Intent(this, PaymentReviewActivity::class.java)
+                intent.putExtra("SINGLE_BILL_ID", bill.id)
+                intent.putExtra("SINGLE_BILL_AMOUNT", bill.billAmount)
+                intent.putExtra("SINGLE_BILL_NUMBER", bill.billNumber)
+                intent.putExtra("SINGLE_BILL_SUBSCRIPTION_ID", bill.subscription.id)
+                startActivity(intent)
             }
         }
     }
diff --git a/app/src/main/java/sh/sar/gridflow/PaymentReviewActivity.kt b/app/src/main/java/sh/sar/gridflow/PaymentReviewActivity.kt
index 5a5cc84..6203616 100644
--- a/app/src/main/java/sh/sar/gridflow/PaymentReviewActivity.kt
+++ b/app/src/main/java/sh/sar/gridflow/PaymentReviewActivity.kt
@@ -33,6 +33,15 @@ class PaymentReviewActivity : AppCompatActivity() {
     private lateinit var paymentMethodAdapter: PaymentMethodAdapter
     
     private var outstandingBills: List<OutstandingBill> = emptyList()
+    private var isSingleBillMode: Boolean = false
+    private var singleBillData: SingleBillData? = null
+    
+    data class SingleBillData(
+        val billId: Long,
+        val amount: String,
+        val billNumber: String,
+        val subscriptionId: Long
+    )
     
     companion object {
         private const val TAG = "PaymentReviewActivity"
@@ -50,10 +59,27 @@ class PaymentReviewActivity : AppCompatActivity() {
         secureStorage = SecureStorage(this)
         apiService = FenakaApiService()
         
+        // Check if this is single bill mode
+        checkForSingleBillMode()
+        
         setupViews()
         loadData()
     }
     
+    private fun checkForSingleBillMode() {
+        val billId = intent.getLongExtra("SINGLE_BILL_ID", -1L)
+        if (billId != -1L) {
+            isSingleBillMode = true
+            singleBillData = SingleBillData(
+                billId = billId,
+                amount = intent.getStringExtra("SINGLE_BILL_AMOUNT") ?: "0.00",
+                billNumber = intent.getStringExtra("SINGLE_BILL_NUMBER") ?: "",
+                subscriptionId = intent.getLongExtra("SINGLE_BILL_SUBSCRIPTION_ID", -1L)
+            )
+            Log.d(TAG, "Single bill mode activated for bill: ${singleBillData?.billNumber}")
+        }
+    }
+    
     private fun setupViews() {
         // Setup bills RecyclerView
         billSummaryAdapter = BillSummaryAdapter()
@@ -80,6 +106,49 @@ class PaymentReviewActivity : AppCompatActivity() {
             return
         }
         
+        if (isSingleBillMode) {
+            loadSingleBillMode(cookie)
+        } else {
+            loadOutstandingBillsMode(cookie)
+        }
+    }
+    
+    private fun loadSingleBillMode(cookie: String) {
+        singleBillData?.let { billData ->
+            // Create fake OutstandingBill for single bill mode
+            val fakeOutstandingBill = OutstandingBill(
+                id = billData.billId,
+                branchName = "",
+                subscriptionId = billData.subscriptionId,
+                subscriptionStatus = "active",
+                subscriptionNumber = billData.billNumber,
+                outstandingBillCount = "1",
+                billAmount = billData.amount,
+                paidAmount = "0",
+                outstandingAmount = billData.amount
+            )
+            outstandingBills = listOf(fakeOutstandingBill)
+            updateBillsUI()
+        }
+        
+        showLoading(true)
+        lifecycleScope.launch {
+            // Load payment methods
+            when (val gatewaysResult = apiService.getPaymentGateways("connect.sid=$cookie")) {
+                is ApiResult.Success -> {
+                    paymentMethodAdapter.updatePaymentMethods(gatewaysResult.data)
+                    showLoading(false)
+                }
+                is ApiResult.Error -> {
+                    Log.e(TAG, "Failed to load payment gateways: ${gatewaysResult.message}")
+                    showLoading(false)
+                    Toast.makeText(this@PaymentReviewActivity, "Failed to load payment methods", Toast.LENGTH_SHORT).show()
+                }
+            }
+        }
+    }
+    
+    private fun loadOutstandingBillsMode(cookie: String) {
         showLoading(true)
         
         lifecycleScope.launch {
diff --git a/app/src/main/java/sh/sar/gridflow/ui/billhistory/BillCardAdapter.kt b/app/src/main/java/sh/sar/gridflow/ui/billhistory/BillCardAdapter.kt
index dda053b..8de4226 100644
--- a/app/src/main/java/sh/sar/gridflow/ui/billhistory/BillCardAdapter.kt
+++ b/app/src/main/java/sh/sar/gridflow/ui/billhistory/BillCardAdapter.kt
@@ -1,13 +1,14 @@
 package sh.sar.gridflow.ui.billhistory
 
+import android.content.Intent
 import android.view.LayoutInflater
 import android.view.View
 import android.view.ViewGroup
 import android.widget.TextView
-import android.widget.Toast
 import androidx.core.content.ContextCompat
 import androidx.recyclerview.widget.RecyclerView
 import com.google.android.material.button.MaterialButton
+import sh.sar.gridflow.PaymentReviewActivity
 import sh.sar.gridflow.R
 import sh.sar.gridflow.data.Bill
 import java.text.SimpleDateFormat
@@ -67,7 +68,13 @@ class BillCardAdapter(
                 payNowButton.visibility = View.VISIBLE
                 
                 payNowButton.setOnClickListener {
-                    Toast.makeText(itemView.context, "Coming soon", Toast.LENGTH_SHORT).show()
+                    // Navigate to PaymentReviewActivity for this bill
+                    val intent = Intent(itemView.context, PaymentReviewActivity::class.java)
+                    intent.putExtra("SINGLE_BILL_ID", bill.id)
+                    intent.putExtra("SINGLE_BILL_AMOUNT", bill.billAmount)
+                    intent.putExtra("SINGLE_BILL_NUMBER", bill.billNumber)
+                    intent.putExtra("SINGLE_BILL_SUBSCRIPTION_ID", bill.subscription.id)
+                    itemView.context.startActivity(intent)
                 }
             }
             
diff --git a/app/src/main/java/sh/sar/gridflow/ui/billhistory/BillDetailsActivity.kt b/app/src/main/java/sh/sar/gridflow/ui/billhistory/BillDetailsActivity.kt
index 839f0c1..59f5eec 100644
--- a/app/src/main/java/sh/sar/gridflow/ui/billhistory/BillDetailsActivity.kt
+++ b/app/src/main/java/sh/sar/gridflow/ui/billhistory/BillDetailsActivity.kt
@@ -17,6 +17,7 @@ import androidx.appcompat.app.AppCompatActivity
 import androidx.core.content.ContextCompat
 import androidx.core.content.FileProvider
 import androidx.lifecycle.ViewModelProvider
+import sh.sar.gridflow.PaymentReviewActivity
 import sh.sar.gridflow.R
 import sh.sar.gridflow.data.Bill
 import sh.sar.gridflow.databinding.ActivityBillDetailsBinding
@@ -155,7 +156,15 @@ class BillDetailsActivity : AppCompatActivity() {
         }
         
         binding.payNowButton.setOnClickListener {
-            Toast.makeText(this, "Coming soon", Toast.LENGTH_SHORT).show()
+            currentBill?.let { bill ->
+                // Navigate to PaymentReviewActivity for this bill
+                val intent = Intent(this, PaymentReviewActivity::class.java)
+                intent.putExtra("SINGLE_BILL_ID", bill.id)
+                intent.putExtra("SINGLE_BILL_AMOUNT", bill.billAmount)
+                intent.putExtra("SINGLE_BILL_NUMBER", bill.billNumber)
+                intent.putExtra("SINGLE_BILL_SUBSCRIPTION_ID", bill.subscription.id)
+                startActivity(intent)
+            }
         }
     }