One-Click VietQR Deposit & Webhook Receiver Simulator

Console / Sandboxes / VietQR Ingestion & Webhook Tester

Session Token: sess_9921_vn_uat Latency Target: < 25ms

Sandbox Balance trending_up+3.4%

50,000,000

VND

≈ $2,000.00 USD 50,000 MCU

Simulated Bank Nodes 3 / 3 Online

Vietcombank 12ms

MBBank (NAPAS) 8ms

Techcombank 15ms

Webhook Delivery Rate p95: 14ms

99.98%

SLO MET

0 dropped 14,892 dispatched

HMAC Signature Mode TAMPER EVIDENT

verified_user

SHA-256 Strict

Key ID: 0x8f9b...33c0

Integrity: REPLAY_SHIELD_ACTIVE

qr_code_scanner

VietQR Fast Pay Generator

NAPAS 247

Select Ingestion Amount

Order Reference

Beneficiary Entity

MEKONG SAIGON FINTECH LABS verified

Settlement Account / Routing

0392 8492 001 MBBank (970422)

VIETQR NAPAS 247

EMVCo Compliant

hourglass_top Session TTL: 09:42 remaining

NAPAS 247 Protocol: EMVCo v2.3 ISO 8583 Bridge: OK

terminal

Webhook Ingestion Engine

LISTENING

POST https://sandbox.mekong.io/api/v1/webhooks/vietqr

vietqr_inbound_event.json

application/json UTF-8

{
  "transactionId": "TXN_VN_984102",
  "status": "PAID",
  "amount": 500000,
  "currency": "VND",
  "bankCode": "MBBANK",
  "bankAccount": "03928492001",
  "paymentTime": "2025-05-18T14:28:10+07:00",
  "reference": "ORD-MK-9982",
  "gatewayRef": "NAPAS_247_R994021",
  "signature": "7f8b92c4e09f893d5c80...a41"
}

lock HMAC Authentication Vector

Valid Key (Standard)

Computed Digest e3b0c44298fc1c...

Payload Inbound Digest e3b0c44298fc1c...

check_circle Computed == Received Digest MATCH (200 OK)

Dispatches synthetic ISO 8583 notification Avg processing: ~12ms

account_balance_wallet

Cloud MCU Ledger

REALTIME

Exchange Formula

1,000 VND ═════► 1.0 MCU Credit

Mekong Compute Units (MCU) power autonomous agent fleet operations and WASM sandbox containers.

Live Balance Impact

Current MCU: 50,000 MCU

add_circleDelta Credit: +500 MCU

Projected Ledger: 50,500 MCU

State Commitment BLOCK #941,210

Merkle Root: 0x7f4e8b39c2...9a21e4

Settlement Target: SQLite WAL (4ms)

Auto-Replenish Fleet

Trigger when balance < 5k MCU

Ledger Integrity: OK Sync: 0.8s ago

table_rows

Webhook Dispatch Audit Stream

Real-time HTTP delivery logs, latency metrics, and signature validations

Timestamp (UTC+7)	Event Type	Webhook ID	Bank Source	Amount (VND)	Latency	HMAC Status	HTTP Status
14:28:10.104	payment.success	wh_98412_mb	MBBank (NAPAS)	500,000	12ms	verifiedVALID HMAC	200 OK
14:15:02.890	payment.failed	wh_98409_vcb	Vietcombank	100,000	8ms	errorINVALID SIG	400 BAD SIG
14:02:44.218	payment.success	wh_98398_tcb	Techcombank	2,000,000	16ms	verifiedVALID HMAC	200 OK
13:51:19.450	payment.success	wh_98380_mb	MBBank (NAPAS)	500,000	11ms	verifiedVALID HMAC	200 OK

Showing rows 1-4 of 12 • WAL Pipe: 0ms buffer delay