diff --git a/demo.html b/demo.html
index d1f37e2..60af122 100644
--- a/demo.html
+++ b/demo.html
@@ -270,7 +270,8 @@ <h5 class="px-4">WorldApp SendTransaction tuple</h5>
 
                     const USDCE = '0x7F5c764cBc14f9669B88837ca1490cCa17c31607'
 
-                    const ZERO = '0x0000000000000000000000000000000000000000'
+                    const ZERO_ADDRESS = '0x0000000000000000000000000000000000000000'
+                    const ZERO_BYTES = '0x'
                     
                     const PAYMENT_RECEIVER = '0x317D875cA3B9f8d14f960486C0d1D1913be74e90'
 
@@ -317,15 +318,15 @@ <h5 class="px-4">WorldApp SendTransaction tuple</h5>
                                     "0", // protocolAmount
                                     paymentDeadline.toString(), // deadline
                                     USDCE, // tokenInAddress
-                                    ZERO, // exchangeAddress
+                                    ZERO_ADDRESS, // exchangeAddress
                                     USDCE, // tokenOutAddress
                                     PAYMENT_RECEIVER, // paymentReceiverAddress
-                                    ZERO, // feeReceiverAddress
-                                    "0", // exchangeType
-                                    "0", // receiverType
+                                    ZERO_ADDRESS, // feeReceiverAddress
+                                    0, // exchangeType
+                                    0, // receiverType
                                     true, // permit2
-                                    ZERO, // exchangeCallData
-                                    ZERO, // receiverCallData
+                                    ZERO_BYTES, // exchangeCallData
+                                    ZERO_BYTES, // receiverCallData
                                   ],
                                   [ // permitTransferFromAndSignature
                                     [ // permitTransferFrom
@@ -387,7 +388,8 @@ <h5 class="px-4">WorldApp SendTransaction tuple with explicit method with args</
 
                     const USDCE = '0x7F5c764cBc14f9669B88837ca1490cCa17c31607'
 
-                    const ZERO = '0x0000000000000000000000000000000000000000'
+                    const ZERO_ADDRESS = '0x0000000000000000000000000000000000000000'
+                    const ZERO_BYTES = '0x'
                     
                     const PAYMENT_RECEIVER = '0x317D875cA3B9f8d14f960486C0d1D1913be74e90'
 
@@ -434,15 +436,15 @@ <h5 class="px-4">WorldApp SendTransaction tuple with explicit method with args</
                                     "0", // protocolAmount
                                     paymentDeadline.toString(), // deadline
                                     USDCE, // tokenInAddress
-                                    ZERO, // exchangeAddress
+                                    ZERO_ADDRESS, // exchangeAddress
                                     USDCE, // tokenOutAddress
                                     PAYMENT_RECEIVER, // paymentReceiverAddress
-                                    ZERO, // feeReceiverAddress
-                                    "0", // exchangeType
-                                    "0", // receiverType
+                                    ZERO_ADDRESS, // feeReceiverAddress
+                                    0, // exchangeType
+                                    0, // receiverType
                                     true, // permit2
-                                    ZERO, // exchangeCallData
-                                    ZERO, // receiverCallData
+                                    ZERO_BYTES, // exchangeCallData
+                                    ZERO_BYTES, // receiverCallData
                                   ],
                                   [ // permitTransferFromAndSignature
                                     [ // permitTransferFrom
@@ -502,7 +504,8 @@ <h5 class="px-4">Test DePay V3 SignatureTransfer</h5>
 
                     const USDCE = '0x7F5c764cBc14f9669B88837ca1490cCa17c31607'
 
-                    const ZERO = '0x0000000000000000000000000000000000000000'
+                    const ZERO_ADDRESS = '0x0000000000000000000000000000000000000000'
+                    const ZERO_BYTES = '0x'
                     
                     const PAYMENT_RECEIVER = '0x08B277154218CCF3380CAE48d630DA13462E3950'
 
@@ -583,21 +586,21 @@ <h5 class="px-4">Test DePay V3 SignatureTransfer</h5>
                       method: "pay", 
                       params: [
                         [ // payment
-                          amount, // amountIn
-                          amount, // paymentAmount
-                          0, // feeAmount
-                          0, // protocolAmount
+                          amount.toString(), // amountIn
+                          amount.toString(), // paymentAmount
+                          "0", // feeAmount
+                          "0", // protocolAmount
                           paymentDeadline, // deadline
                           USDCE, // tokenInAddress
-                          ZERO, // exchangeAddress
+                          ZERO_ADDRESS, // exchangeAddress
                           USDCE, // tokenOutAddress
                           PAYMENT_RECEIVER, // paymentReceiverAddress
-                          ZERO, // feeReceiverAddress
+                          ZERO_ADDRESS, // feeReceiverAddress
                           0, // exchangeType
                           0, // receiverType
                           true, // permit2
-                          ZERO, // exchangeCallData
-                          ZERO, // receiverCallData
+                          ZERO_BYTES, // exchangeCallData
+                          ZERO_BYTES, // receiverCallData
                         ],
                         [ // permitTransferFromAndSignature
                           [ // permitTransferFrom