nell-scb-lib 1.0.3

Nellika SCB Payment Integration - Hardened C Module

nell-scb-lib

Python C extension for SCB (Siam Commercial Bank) payment integration with PromptPay QR code generation.

Overview

nell-scb-lib is a high-performance C extension module providing SCB payment integration for Python applications. It handles OAuth token management, QR code generation, and payment status checking through SCB's official API.

Installation

pip install nell-scb-lib

Supported Platforms:

• Linux x86_64 (manylinux)
• macOS ARM64 (Apple Silicon M1/M2/M3)
• Python 3.8+

Quick Start

import nell_scb_lib

# Create QR payment (database-driven, recommended)
result = nell_scb_lib.create_qr_by_bank_account(
    bank_account_id=1,
    amount=250.75,
    ref1="P00001",      # Invoice number (max 20 chars)
    ref2="CUST001",     # Customer code (max 12 chars)
    ref3="SCB"          # Optional reference
)

if result['status']['code'] == 1000:
    qr_image = result['data']['qrImage']  # Base64 PNG
    qr_raw = result['data']['qrRawData']  # PromptPay string
    print(f"QR created: {result['data']['transactionId']}")

Environment Variables

Required for database-driven methods:

export PGDATABASE=your_database
export PGHOST=localhost
export PGPORT=5432
export PGUSER=odoo
export PGPASSWORD=your_password  # optional

API Reference

High-Level API (Recommended)

create_qr_by_bank_account(bank_account_id, amount, ref1, ref2, ref3="SCB")

Create SCB QR payment code using bank account ID. Automatically fetches configuration from database and manages token refresh.

Parameters:

• bank_account_id (str/int): Bank account ID from res.partner.bank
• amount (float): Payment amount in THB
• ref1 (str): Reference 1, max 20 characters
• ref2 (str): Reference 2, max 12 characters
• ref3 (str, optional): Reference 3, defaults to "SCB"

Returns: dict - SCB API response

{
    "status": {"code": 1000, "description": "Success"},
    "data": {
        "qrRawData": "00020101021230...",
        "qrImage": "iVBORw0KGgoAAAANSUhEUgAA...",
        "transactionId": "..."
    }
}

Example:

result = nell_scb_lib.create_qr_by_bank_account(
    bank_account_id=1,
    amount=250.75,
    ref1="P00001",
    ref2="CUST001"
)

---

Mid-Level API

create_qr_full(api_key, access_token, qr_create_url, biller_id, amount, ref1, ref2, ref3="SCB")

Create SCB QR code with explicit parameters (requires manual token management).

Parameters:

• api_key (str): SCB API key
• access_token (str): Valid OAuth token
• qr_create_url (str): SCB QR endpoint URL
• biller_id (str): PromptPay biller ID
• amount (float): Payment amount in THB
• ref1 (str): Reference 1, max 20 characters
• ref2 (str): Reference 2, max 12 characters
• ref3 (str, optional): Reference 3, defaults to "SCB"

Returns: dict - SCB API response

Example:

# Step 1: Get access token
token_resp = nell_scb_lib.refresh_token(api_key, api_secret, token_url)
access_token = token_resp['data']['accessToken']

# Step 2: Create QR
result = nell_scb_lib.create_qr_full(
    api_key="your_api_key",
    access_token=access_token,
    qr_create_url="https://api.scb/...",
    biller_id="894547854396914",
    amount=100.50,
    ref1="P00001",
    ref2="TEST"
)

---

refresh_token(api_key, api_secret, token_url)

Refresh SCB OAuth access token.

Parameters:

• api_key (str): SCB API key
• api_secret (str): SCB API secret
• token_url (str): Token endpoint URL

Returns: dict - Token response

{
    "status": {"code": 1000, "description": "Success"},
    "data": {
        "accessToken": "eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9...",
        "expiresIn": 1800,
        "tokenType": "Bearer"
    }
}

---

Low-Level API

create_qr(config_id, amount, reference, channel="ecomm")

Create QR code using config ID from database (legacy method).

Parameters:

• config_id (str): SCB API configuration ID
• amount (float): Payment amount
• reference (str): Payment reference
• channel (str, optional): Payment channel, defaults to "ecomm"

Returns: dict - SCB API response

---

check_payment(reference)

Check SCB payment status by reference.

Parameters:

• reference (str): Payment reference to check

Returns: dict - Payment status

{
    "status": {"code": 1000, "description": "Success"},
    "data": {
        "paymentStatus": "SUCCESS",
        "transactionId": "...",
        "amount": 100.50
    }
}

---

version()

Get module version string.

Returns: str - Version (e.g., "1.0.1")

---

Database Schema Requirements

For database-driven methods, these tables are required:

res_partner_bank:

• Column: scb_biller_id (VARCHAR) - PromptPay biller ID

scb_api_config:

• Columns: api_key, api_secret, environment, token_url, qr_create_url, payment_inquiry_url
• Must have active configuration record

Error Handling

All functions raise RuntimeError for failures:

try:
    result = nell_scb_lib.create_qr_by_bank_account(
        bank_account_id=1,
        amount=250.75,
        ref1="P00001",
        ref2="CUST001"
    )
    
    if result['status']['code'] == 1000:
        # Success
        qr_data = result['data']
    else:
        # API error
        print(f"Error: {result['status']['description']}")
        
except RuntimeError as e:
    # System error
    print(f"Failed: {e}")

Response Status Codes

• 1000: Success
• 1001: Invalid request
• 1002: Authentication failed
• 1003: Insufficient balance
• 1004: Transaction not found
• 1005: System error

Always check the status code:

if result['status']['code'] == 1000:
    # Process successful response
    pass
else:
    # Handle error
    error_msg = result['status']['description']

Best Practices

1. Use High-Level API: Prefer create_qr_by_bank_account() for automatic configuration management
2. Validate References: Keep ref1 ≤ 20 chars, ref2 ≤ 12 chars
3. Check Status Codes: Always verify status.code == 1000 before using data
4. Handle Errors: Wrap API calls in try-except blocks
5. Environment Setup: Configure PostgreSQL environment variables before use

Features

• ✅ Native C implementation for high performance
• ✅ Automatic OAuth token management
• ✅ Database-driven configuration
• ✅ PromptPay QR code generation
• ✅ Payment status checking
• ✅ Thread-safe operations
• ✅ Secure API communication (libcurl)

License

Proprietary - Nellika Consulting Services