# VISA Network Integration

GuCard’s integration with VISA unlocks **global acceptance** while ensuring high transaction reliability and security. By inheriting VISA’s robust infrastructure, GuCard combines blockchain capabilities with traditional financial rails. Below is a technical breakdown of how this works.

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## **1. How VISA Network Integration Works**

### **1.1 Payment Routing Mechanism**

When a transaction is initiated using GuCard, the payment request flows through the VISA **global payment network**, which:

* **Authenticates the card details** through tokenization.
* **Validates the transaction** with VISA’s fraud prevention systems.
* **Routes the request** to the issuing bank (or Gumart liquidity provider in crypto-based payments).

**Technical Flow:**

* [x] User swipes GuCard or enters card details at the POS/e-commerce terminal.
* [x] Merchant submits the request to the VISA network.
* [x] VISA processes and routes the transaction request:
  * **Fiat Transactions**: The user’s fiat account (loaded on GuCard) is charged directly.
  * **Crypto Transactions**: If the user pays in crypto, the conversion flow is triggered (see 3.3).
* [x] Approval is sent back to the merchant, completing the transaction.

### **1.2. VISA Tokenization Technology**

Every transaction initiated via GuCard uses **VISA’s Tokenization Service** (VTS):

* Replaces sensitive card details (e.g., card number, CVV) with encrypted **tokenized identifiers**.
* Reduces risk of card information leaks during transactions.
* **Why It Matters**: Enhances payment security without compromising transaction speed.

**How Tokenization Works:**

1. User card data → Encrypted into a secure token.
2. Token sent to the merchant → No sensitive data is exposed.
3. VISA network validates the token and approves the transaction.

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### **1.3. VISA Multi-Currency Conversion**

GuCard utilizes VISA’s **Multi-Currency Conversion System (MCCS)** to enable real-time payments in **200+ local currencies**.

**Key Capabilities:**

* **Automatic Currency Matching**: If a user pays in BTC, GuCard instantly converts it to the merchant’s preferred fiat currency (e.g., USD, EUR).
* **Dynamic Exchange Rates**: VISA fetches real-time exchange rates from its global pricing network.
* **Zero Conversion Delays**: Crypto-to-fiat transactions are processed in under 1 second.

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## **2. Security and Compliance**

By leveraging VISA’s infrastructure, GuCard ensures all transactions comply with:

* **PCI DSS Compliance**: GuCard inherits VISA’s Payment Card Industry Data Security Standards, ensuring robust security across card networks.
* **AML/KYC Protocols**: All GuCard users pass KYC verification to comply with anti-money laundering regulations.
