PromptPay QR Code Generator - PHP

A modern, type-safe PHP library for generating PromptPay QR codes.

Features

• Zero Config - Works out of the box with sensible defaults
• Multiple Formats - PNG, SVG, GIF support
• Amount Support - Static or dynamic QR codes
• CLI Tool - Command-line interface included

Requirements

• PHP 8.1 or higher
• Composer

Installation

For PHP Applications

composer require farzai/promptpay

For CLI Usage (Global)

composer global require farzai/promptpay

Make sure Composer's global bin directory is in your $PATH:

• macOS/Linux: ~/.composer/vendor/bin or ~/.config/composer/vendor/bin
• Windows: %USERPROFILE%\AppData\Roaming\Composer\vendor\bin

Quick Start

Simple Example

use Farzai\PromptPay\PromptPay;

// Generate QR code (backward compatible)
$qrCode = PromptPay::create('0899999999', 100);
echo $qrCode; // Raw payload string

Modern Builder API (Recommended)

use Farzai\PromptPay\PromptPay;

// Immutable builder pattern
$result = PromptPay::generate('0899999999')
    ->withAmount(100.50)
    ->toDataUri('png');

echo '<img src="' . $result->getData() . '" />';

Usage Guide

Creating QR Codes

Static QR Code (No Amount)

// Customer scans and enters amount themselves
$qrCode = PromptPay::generate('0899999999')->build();

Dynamic QR Code (With Amount)

// Amount is pre-filled in payment app
$result = PromptPay::qrCode('0899999999', 150.75)
    ->toDataUri('png');

Recipient Types

The library automatically detects recipient type based on length:

// Phone Number (10 digits)
PromptPay::generate('0899999999');

// Tax ID / Citizen ID (13 digits)
PromptPay::generate('1234567890123');

// E-Wallet ID (15 digits)
PromptPay::generate('123456789012345');

// Special characters are automatically removed
PromptPay::generate('089-999-9999'); // Works!

Output Formats

1. Data URI (for <img> tags)

$result = PromptPay::generate('0899999999')
    ->withAmount(100)
    ->toDataUri('png');

echo '<img src="' . $result->getData() . '" />';

// Available formats: png, svg, pdf, gif

2. Save to File

$result = PromptPay::qrCode('0899999999', 100)
    ->toFile('qrcode.png');

echo 'Saved to: ' . $result->getPath();
echo 'File size: ' . $result->getSize() . ' bytes';

3. PSR-7 HTTP Response

First, install any PSR-17/PSR-7 implementation:

# Choose one:
composer require nyholm/psr7
# or
composer require guzzlehttp/psr7

Then create the response:

use Nyholm\Psr7\Factory\Psr17Factory;

// Create PSR-17 factory (implements both ResponseFactory and StreamFactory)
$factory = new Psr17Factory();

$response = PromptPay::generate('0899999999')
    ->withAmount(100)
    ->toResponse($factory, $factory);

// Returns PSR-7 ResponseInterface
// Perfect for Laravel, Symfony, Slim, etc.
return $response;

With Guzzle PSR-7:

use GuzzleHttp\Psr7\HttpFactory;

$factory = new HttpFactory();
$response = PromptPay::generate('0899999999')
    ->withAmount(100)
    ->toResponse($factory, $factory);

Why PSR-17? No hard dependencies! Works with ANY PSR-7 library - choose the one your project already uses.

4. Console Output (CLI)

use Symfony\Component\Console\Output\ConsoleOutput;

$output = new ConsoleOutput();
PromptPay::generate('0899999999')
    ->withAmount(100)
    ->toConsole($output);

5. Raw Payload String

$payload = PromptPay::generate('0899999999')
    ->withAmount(100)
    ->toPayload();

echo $payload;
// 00020101021229370016A000000677010111011300668999999995802TH53037645406100.006304CB89

Advanced Configuration

use Farzai\PromptPay\PromptPay;
use Farzai\PromptPay\ValueObjects\QrCodeConfig;

// Custom QR code size and margin
$config = QrCodeConfig::create(
    size: 400,      // 400x400 pixels
    margin: 20,     // 20px margin
    encoding: 'UTF-8'
);

$result = PromptPay::generate('0899999999')
    ->withAmount(100)
    ->withConfig($config)
    ->toDataUri('svg');

Immutable Builder Pattern

The builder is fully immutable - each method returns a new instance:

$builder1 = PromptPay::generate('0899999999')->withAmount(100);
$builder2 = $builder1->withAmount(200); // New instance!

echo $builder1->getAmount(); // 100
echo $builder2->getAmount(); // 200

Validation & Error Handling

The library provides comprehensive validation with helpful error messages:

Recipient Validation

use Farzai\PromptPay\Exceptions\InvalidRecipientException;

try {
    PromptPay::generate('12345')->build(); // Too short
} catch (InvalidRecipientException $e) {
    echo $e->getMessage();
    // "Invalid recipient length: 5 digits. Expected formats:
    // Too short! • Phone Number: 10 digits (e.g., 0899999999)
    // • Tax ID: 13 digits (e.g., 1234567890123)
    // • E-Wallet ID: 15 digits (e.g., 123456789012345)"

    echo $e->getCode(); // 1003
}

Amount Validation

use Farzai\PromptPay\Exceptions\InvalidAmountException;

try {
    PromptPay::qrCode('0899999999', -50)->build();
} catch (InvalidAmountException $e) {
    echo $e->getMessage();
    // "Invalid amount: -50.00 THB cannot be negative.
    // Please provide a positive amount."

    echo $e->getCode(); // 2002
}

Error Codes Reference

Recipient Errors (1xxx)

• 1001 - Empty recipient
• 1002 - Not numeric
• 1003 - Invalid length
• 1004 - Empty after normalization

Amount Errors (2xxx)

• 2001 - Not numeric
• 2002 - Negative amount
• 2003 - Too large (> 999,999,999.99)
• 2004 - Zero (when positive required)
• 2005 - Too small (< 0.01)

Configuration Errors (3xxx)

• 3001 - Size too small
• 3002 - Size too large
• 3003 - Margin too small
• 3004 - Margin too large
• 3005 - Invalid encoding
• 3006 - Invalid path
• 3007 - Missing dependency

CLI Usage

# Basic usage
promptpay 0899999999 100

# Interactive mode (no arguments)
promptpay

# Output shows QR code in terminal

Testing

# Run tests
composer test

# Run tests with coverage
composer test-coverage

# Run static analysis
composer analyse

# Run code formatting
composer format

Examples

Check the examples/ directory for real-world usage scenarios:

• 01-basic-usage.php - Basic QR code generation and builder patterns
• 02-file-generation.php - Saving to files with custom configurations
• 03-error-handling.php - Comprehensive error handling patterns
• 04-web-integration.php - Web form integration with HTML
• 05-laravel-integration.php - Laravel framework integration
• 06-symfony-integration.php - Symfony framework integration
• 07-custom-validation.php - Custom validation patterns and business rules
• 08-batch-generation.php - Batch processing and bulk generation

Contributing

Contributions are welcome! Please see CONTRIBUTING.md for details.

Security

If you discover any security vulnerabilities, please review our security policy on how to report them.

Changelog

Please see CHANGELOG.md for recent changes.

License

The MIT License (MIT). Please see LICENSE.md for more information.

Credits

• parsilver
• All Contributors

Acknowledgments

• Built with endroid/qr-code
• Follows PromptPay EMV QR Code Specification
• Inspired by Thailand's National e-Payment Master Plan

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Made with ❤️ for the Thai developer community