nell-scb-lib 1.6.2

Nellika SCB Payment Integration - Hardened C Module (Commercial License Required)

nell-scb-lib

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

⚠️ IMPORTANT LICENSING INFORMATION

This software is subject to commercial licensing terms and usage fees.

• This library requires a valid commercial license for production use
• Usage telemetry data is collected and transmitted to Nellika Consulting Services Ltd.
• By installing and using this library, you agree to the collection and transmission of usage telemetry
• For licensing inquiries and pricing information, please contact: [e-mail]

Copyright © 2024 Nellika Consulting Services Ltd. All rights reserved.

---

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_2_31+)
• macOS ARM64 (Apple Silicon M1/M2/M3/M4)
• Python 3.9 through 3.14

Telemetry & Privacy

This library collects the following telemetry data:

• License key usage and validation events
• API operation counts (QR creation, token refresh, payment checks)
• Error rates and types
• Library version and platform information
• No sensitive data (API keys, secrets, transaction details, or customer information) is collected

Telemetry helps us:

• Monitor license compliance
• Improve library stability and performance
• Provide better support to our customers

By using this library, you consent to this data collection.

For questions about data collection or to request data deletion, contact: [e-mail]

---

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_for_invoice(invoice_id, company_id, config_id, reference, amount, bank_account_id)

Smart Intent Caching - Create SCB QR code for invoices with automatic caching. Returns cached QR if intent already exists (prevents duplicate API calls).

Parameters:

• invoice_id (int): Invoice ID from account.move
• company_id (int): Company ID
• config_id (int): SCB API configuration ID
• reference (str): Payment reference (e.g. "I202500096")
• amount (float): Payment amount in THB
• bank_account_id (str): Bank account ID from res.partner.bank

Returns: dict - Intent data with QR

{
    "intent_id": 35,
    "reference": "I202500096",
    "amount": 11.77,
    "qr_payload": "00020101021230...",
    "qr_image_base64": "iVBORw0KGgoAAAANSUhEUgAA...",
    "transaction_id": "202512047YrL0GYH1tAUC0t",
    "status": "pending",
    "channel": "invoice"
}

Example:

import nell_scb_lib

result = nell_scb_lib.create_qr_for_invoice(
    invoice_id=118,
    company_id=1,
    config_id=1,
    reference="I202500096",
    amount=11.77,
    bank_account_id="1"
)
print(f"Intent: {result['intent_id']}, QR: {result['qr_payload'][:50]}...")

---

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 using config ID
token_resp = nell_scb_lib.refresh_token(config_id=1)
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(config_id)

Refresh SCB OAuth access token using config ID. Automatically fetches API credentials from database and determines token URL based on environment.

Parameters:

• config_id (int): SCB API configuration ID from scb_api_config table

Returns: dict - Token response

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

Example:

result = nell_scb_lib.refresh_token(config_id=1)
if result['status']['code'] == 1000:
    token = result['data']['accessToken']

---

payment_inquiry(config_id, transaction_ref=None, biller_id=None, reference1=None, reference2=None, amount=None, transaction_date=None)

Check SCB payment status via payment inquiry API. Supports both Tag 31 (transaction ID) and Tag 30 (reference) inquiry modes.

Parameters:

• config_id (int): SCB API configuration ID
• transaction_ref (str, optional): Transaction reference for Tag 31 inquiry
• biller_id (str, optional): PromptPay biller ID for Tag 30 inquiry
• reference1 (str, optional): Reference 1 for Tag 30 inquiry
• reference2 (str, optional): Reference 2 for Tag 30 inquiry
• amount (str, optional): Payment amount for Tag 30 inquiry
• transaction_date (str, optional): Transaction date (YYYY-MM-DD)

Returns: dict - Payment inquiry response

{
    "status": {"code": 1000, "description": "Success"},
    "data": {
        "paymentStatus": "PAID",
        "transactionId": "202512143idG583rgs8s5ps",
        "amount": "100.00",
        "billPaymentRef1": "P00001"
    }
}

Example:

# Tag 31 inquiry (by transaction ID)
result = nell_scb_lib.payment_inquiry(
    config_id=1,
    transaction_ref="202512143idG583rgs8s5ps"
)

# Tag 30 inquiry (by reference)
result = nell_scb_lib.payment_inquiry(
    config_id=1,
    biller_id="010555555555555",
    reference1="P00001",
    amount="100.00"
)

---

Low-Level API (Legacy)

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

Deprecated - Use create_qr_by_bank_account() or create_qr_for_invoice() instead.

Create QR code using config ID from database.

Parameters:

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

Returns: str - JSON string (not dict)

---

check_payment(reference)

Deprecated - Use payment_inquiry() instead for better control and error handling.

Check SCB payment status by reference.

Parameters:

• reference (str): Payment reference to check

Returns: str - JSON string (not dict)

---

version()

Get module version string.

Returns: str - Version (e.g., "1.6.2")

---

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 (v1.2.0+)

All functions return dicts with status and data keys. Check status.code to determine success/failure.

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 - use the data
    qr_image = result['data']['qrImage']
    transaction_id = result['data']['transactionId']
    print(f"QR created: {transaction_id}")
else:
    # Error - check the code and description
    error_code = result['status']['code']
    error_msg = result['status']['description']
    print(f"Error {error_code}: {error_msg}")
    
    # Handle specific errors
    if error_code == 5114:
        print("Incorrect biller ID - check your bank account configuration")
    elif error_code in [9001, 9002]:
        print("Database connection issue - check environment variables")
    elif error_code == 9003:
        print("SCB configuration not found for this bank account")

Response Status Codes

Success Codes (1xxx)

• 1000: Success

SCB API Errors (5xxx)

These are errors returned directly from SCB's API:

• 5114: Incorrect biller ID - verify PromptPay biller ID in database
• Other 5xxx codes: See SCB API documentation

System Errors (9xxx)

Database Errors (90xx):

• 9001: Database environment variables not configured
• 9002: Failed to connect to database
• 9003: No SCB configuration found for bank account
• 9004: Invalid SCB API configuration (missing required fields)

Network Errors (91xx):

• 9101: Network error connecting to SCB token endpoint
• 9102: Network error connecting to SCB QR endpoint
• 9103: HTTP error from SCB API (see description for details)

Authentication Errors (93xx):

• 9301: Failed to refresh SCB access token
• 9302: Token refresh failed with HTTP error

Always check the status code:

if result['status']['code'] == 1000:
    # Process successful response
    qr_data = result['data']
else:
    # Handle error - log or display to user
    error_code = result['status']['code']
    error_msg = result['status']['description']
    
    # Example: Raise user-friendly error in Odoo
    if error_code in [5114, 9003, 9004]:
        # Configuration error - show to admin
        raise UserError(f"SCB Configuration Error: {error_msg}")
    else:
        # System error - log it
        _logger.error(f"SCB API error {error_code}: {error_msg}")

Best Practices

1. Use High-Level API:

   • Invoices: Use create_qr_for_invoice() for automatic caching
   • POS/Ecommerce: Use create_qr_by_bank_account()
   • Avoid legacy create_qr() and check_payment()

2. Validate References: Keep ref1 ≤ 20 chars, ref2 ≤ 12 chars

3. Check Status Codes: Always verify status.code == 1000 before using data

4. Payment Status: Use payment_inquiry() for checking payment status:

   • Better error handling
   • Supports both Tag 30 and Tag 31 inquiry
   • Automatic token refresh and retry on 401

5. Handle Errors: Check status codes and handle errors gracefully

6. Environment Setup: Configure PostgreSQL environment variables before use

Features

• ✅ Native C implementation for high performance
• ✅ Smart Intent Caching for invoices (prevents duplicate QR codes)
• ✅ Automatic OAuth token management with retry on 401
• ✅ Database-driven configuration (PostgreSQL)
• ✅ PromptPay QR code generation
• ✅ Payment inquiry API (Tag 30 and Tag 31)
• ✅ Thread-safe operations
• ✅ Secure API communication (libcurl + OpenSSL)
• ✅ Built-in license management
• ✅ Usage telemetry for compliance and support

Changelog

See CHANGELOG.md for detailed version history.

Latest Releases

v1.6.0 (2024-12-24)

• 🔴 BREAKING: refresh_token() signature changed to use config_id instead of raw credentials
• Enhanced security: API URLs and credentials now hidden from Python code
• Consistency: All C library functions use same pattern (IDs, not credentials)
• Simplified usage: refresh_token(config_id=1) instead of passing api_key, api_secret, token_url
• Migration: Old code using 3 parameters needs update to pass single config_id

v1.3.0 (2024-12-03)

• 🆕 Payment Inquiry API: New payment_inquiry() function for checking payment status
• Support for both Tag 30 and Tag 31 inquiry modes
• Automatic token caching and refresh for payment inquiry
• URL computation centralized in C library based on environment

v1.2.4 (2024-12-02)

• ⚡ PERFORMANCE: Automatic token caching in database
• Reduces token refresh API calls by ~95% (~30/day instead of ~100+/day)
• Token management now completely abstracted in C library
• Faster QR generation (no auth overhead when token is cached)

v1.2.3 (2024-12-02)

• 🔴 CRITICAL FIX: Corrected SCB config selection when multiple configs exist
• Fixed "Incorrect biller Id" errors (SCB 5114)
• Added detailed logging for Bank ID, Config ID, Biller ID

View Full Changelog →

---

Support & Contact

• Sales & Licensing: [e-mail]
• Technical Support: [e-mail]
• Privacy Inquiries: [e-mail]
• Website: https://nellika.co.th

Legal

Copyright © 2024 Nellika Consulting Services Ltd. All rights reserved.

This software is proprietary and confidential. Unauthorized copying, distribution, or use of this software, via any medium, is strictly prohibited without prior written permission from Nellika Consulting Services Ltd.

For licensing terms and conditions, please contact [e-mail]