USDT Payment API Integration Guide: UDun Wallet Solutions

Introduction to Cryptocurrency Payment APIs

Modern businesses and applications increasingly rely on open APIs to facilitate technical integrations. Organizations typically provide these interfaces through detailed documentation or language-specific SDK packages. UDun Wallet's development team has created a comprehensive system to streamline digital currency integration, offering:

Complete API documentation
Multi-language SDKs (Java, .NET, PHP)
Exchange-ready solutions

The Dominance of Stablecoin USDT

USDT (Tether) has become the preferred stablecoin for:

Hedging against market volatility
Facilitating reverse operations for digital currency withdrawals
Serving as the primary liquidity instrument across exchanges

With growing demand from:

Cryptocurrency exchanges
E-commerce platforms
Gaming enterprises

API integration has become critical infrastructure. This guide addresses common implementation challenges including interface specifications, procedural steps, and payment system integration.

UDun Wallet: Global Exchange Management Solution

As the world's first exchange wallet management system, UDun Wallet provides:

Security Features

700+ days of secure operation
Global user base across Asia-Pacific and Western markets
$100M+ USDT in cumulative managed assets
$20M daily trading volume

Core Functionalities

Transaction auditing
Automated payments
Fund aggregation

API Implementation Guide

1. Address Generation

1.1 Use Case

Generate deposit addresses for specified currencies.

1.2 Technical Specifications

**Endpoint**: `/mch/address/create`  
**Method**: POST  

**Parameters**:
| Field        | Type   | Required | Description               |
|--------------|--------|----------|---------------------------|
| merchantId   | String | Yes      | Merchant identifier       |
| coinType     | Int    | Yes      | Primary currency code     |
| callUrl      | String | Yes      | Callback URL              |
| walletId     | String | No       | Wallet identifier         |

**Success Response**:

{
"code": 200,
"data": {

"coinType": 520,
"address": "0xbe4e3699cb870bc95365fe04..."

}
}


### 2. Withdrawal Processing

#### 2.1 Key Considerations
- Address validation requirements
- Unique businessId enforcement
- Memo field for XRP/EOS transactions

#### 2.2 Technical Specifications

Endpoint: /mch/withdraw
Method: POST

Parameters:

Field	Type	Required	Description
address	String	Yes	Destination address
amount	String	Yes	Transfer quantity
businessId	String	Yes	Unique transaction ID

Status Codes:

Code	Description
200	Success
4193	Invalid decimal places


👉 [Best practices for secure withdrawals](https://www.okx.com/join/BLOCKSTAR)

---

## Advanced Features

### 3. Proxy Payments
Automated payment processing with fallback to manual approval.

**Implementation Notes**:
- Dual-callback system (approval + transaction status)
- Balance verification requirements

### 4. Transaction Callbacks
Real-time notification system for:
- Deposit confirmations
- Withdrawal status updates

**Callback Types**:
| Code | Description               |
|------|---------------------------|
| 1    | Deposit notification      |
| 2    | Withdrawal notification   |

---

## Technical Appendices

### Currency Code Reference

| Main Code | Sub-Code | Symbol | Full Name        |
|-----------|----------|--------|------------------|
| 0         | 0        | BTC    | Bitcoin          |
| 60        | 60       | ETH    | Ethereum         |
| 0         | 31       | USDT   | Tether USD       |

### Security Protocols

**Signature Verification**:

sign = md5(body + apiKey + nonce + timestamp)


**Address Validation Rules**:
| Currency | Prefix | Length  |
|----------|--------|---------|
| BTC      | 1/3    | 26-36   |
| ETH      | 0x     | 42      |

---

## FAQ: USDT API Integration

**Q1: What minimum security standards should implementations follow?**  
A: Always implement:
- IP whitelisting
- Two-factor authentication
- Rate limiting

**Q2: How are failed transactions handled?**  
A: The system provides:
- Automated retry mechanisms
- Detailed error logging
- Manual reprocessing options

**Q3: What's the typical callback response time?**  
A: Usually within 5-30 seconds, depending on blockchain congestion.

👉 [Understanding callback latency factors](https://www.okx.com/join/BLOCKSTAR)

**Q4: Are testnet environments available?**  
A: Yes, sandbox environments with test USDT are provided for all integration scenarios.

**Q5: How does address generation differ between currencies?**  
A: Implementation varies by:
- Cryptographic algorithms
- Address formatting rules