payware MCP Server


Official MCP (Model Context Protocol) server for payware payment API integration. This server enables AI assistants to interact with payware APIs, automating integration workflows for all partner types.

Who Is This For?

- Merchants - Accept payments, manage products, generate transaction reports
- ISVs (Independent Software Vendors) - Build multi-merchant platforms with OAuth2 token management
- Payment Institutions - Process A2A transfers, handle Payment Choice Architecture with multiple payment methods

What's New in v1.2.0

- SHA-256 Authentication - Upgraded from MD5 to SHA-256 for JWT content hashing (contentSha256 header)
- Updated Error Codes - New error codes: ERR_INVALID_CONTENT_HASH, ERR_MISSING_CONTENT_HASH
- Backward Compatibility - Deprecated MD5 functions retained for legacy support

Features

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- RSA Key Generation: Generate secure 2048-bit RSA key pairs
- JWT Token Creation: Create properly formatted JWT tokens
- Sandbox Setup: Configure sandbox authentication

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- Create Transaction: Support PLAIN, QR, and BARCODE transactions
- Process Transaction: Process transactions with Payment Choice Architecture support
- Transaction Status: Check transaction status by ID
- Transaction History: Get finalized transaction details
- Callback Simulation: Test callback scenarios for merchants and payment institutions

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- Set Price: Configure POI with amount, currency, and payment details
- Cancel Price: Clear active price from POI
- Get POI: Retrieve POI details and current state
- Get Status: Check POI transaction status
- Get QR Code: Generate QR code for POI payments
- List POIs: List all POIs for a merchant

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- Advanced Code Generation: Generate complete integration code across 8 languages (Python, Node.js, PHP, Java, C#, Go, Ruby, cURL) with 16+ framework support
- Framework Integration: Framework-specific examples for Django, FastAPI, Express, NestJS, Laravel, Spring Boot, ASP.NET, and more
- Real-world Scenarios: Generate complete integration scenarios (e-commerce, ISV multi-merchant, P2P payments)
- Comprehensive Documentation: Auto-generate complete API documentation with code examples
- Request Formatting: Format and validate API requests

Quick Start

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From npm (recommended):
``bash
npm install -g @payware/mcp-server
`

From source:
`bash
git clone https://github.com/payware/mcp-server.git
cd mcp-server
npm install
`

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Copy the example environment file and configure your credentials:

`bash
cp .env.example .env
`

Edit .env file:

`env

Partner ID from payware dashboard

PAYWARE_PARTNER_ID=your_partner_id_here

Path to private key file (relative to project root)

PAYWARE_SANDBOX_PRIVATE_KEY_PATH=keys/sandbox-your-private-key.pem
PAYWARE_PRODUCTION_PRIVATE_KEY_PATH=keys/production-your-private-key.pem

Optional: Sandbox base URL (defaults to https://sandbox.payware.eu/api)

PAYWARE_SANDBOX_URL=https://sandbox.payware.eu/api
`

⚠️ Security Note: Never commit the .env file to version control. It contains sensitive credentials.

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`bash
npm start
`

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1. Generate RSA Keys
`
Tool: payware_authentication_generate_rsa_keys
`

2. Create JWT Token
`
Tool: payware_authentication_create_jwt_token
Parameters:
- partnerId: (from PAYWARE_PARTNER_ID)
- privateKey: (from environment-specific key path)
`

3. Setup Sandbox
`
Tool: payware_authentication_setup_sandbox_auth
Parameters:
- partnerId: (from PAYWARE_PARTNER_ID)
`

4. Create Transaction
`
Tool: payware_operations_create_transaction
Parameters:
- partnerId: (from PAYWARE_PARTNER_ID)
- privateKey: (from environment-specific key path)
- amount: 10.00
- currency: EUR
- reasonL1: "Payment description"
- type: PLAIN
`

5. Check Status
`
Tool: payware_operations_get_transaction_status
Parameters:
- partnerId: (from PAYWARE_PARTNER_ID)
- privateKey: (from environment-specific key path)
- transactionId: TRANSACTION_ID
`

API Request Structure

The payware MCP server transforms flat parameter inputs into the proper nested JSON structure required by the payware API:

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`json
{
// ROOT LEVEL - Transaction metadata
"shop": "SHOP001", // Optional: Shop code
"account": "GB29NWBK60161331926810", // Optional: Account identifier
"friendlyName": "Your Shop Name", // Optional: Account holder name
"callbackUrl": "https://callback.url", // Optional: HTTPS callback URL
"passbackParams": "{\"orderId\":\"12345\"}", // Optional: Callback parameters

// TRANSACTION DATA - Required transaction information
"trData": {
"amount": "25.50", // String/Number: Amount (can be "0.00" for flexible amounts)
"currency": "EUR", // REQUIRED: ISO 3-character currency code
"reasonL1": "Payment for services", // REQUIRED: Transaction description (max 100 chars)
"reasonL2": "Order #12345" // Optional: Additional description (max 100 chars)
},

// TRANSACTION OPTIONS - Transaction behavior settings
"trOptions": {
"type": "QR", // PLAIN, QR, or BARCODE (default: PLAIN)
"timeToLive": 300 // Seconds: 60-600 (default: 120)
},

// QR OPTIONS - Only included when type=QR
"qrOptions": {
"qrFormat": "PNG", // PNG, SVG, JPG, GIF, BMP (default: SVG)
"qrBorder": 4, // Border modules: 1-10 (default: 4)
"qrErrorCorrection": "QUARTILE", // LOW, MEDIUM, QUARTILE, HIGH (default: QUARTILE)
"qrScale": 16, // Pixel size: 1-100 (default: 16, irrelevant for SVG)
"qrVersion": 10 // QR version: 1-40 (default: 10, auto if not specified)
},

// BARCODE OPTIONS - Only included when type=BARCODE
"barOptions": {
"barFormat": "SVG", // PNG, SVG, JPG (default: SVG)
"barModuleWidth": 2, // Module width: 1-10 (default: 2)
"barBarHeight": 100, // Height: 15-1000 (default: 100)
"barFontSize": 12, // Font size: 0-24 (default: 12)
"barHumanReadableLocation": "NONE" // NONE, BOTTOM, TOP (default: NONE)
}
}
`

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When using MCP tools, parameters are automatically mapped to the correct API structure:

| MCP Tool Parameter | API Location | Description |
|------------------|-------------|-------------|
| partnerId, privateKey | Authentication | Used for JWT signing, not sent in request |
| account, friendlyName, shop, callbackUrl, passbackParams | Root Level | Transaction metadata |
| amount, currency, reasonL1, reasonL2 | trData object | Core transaction data |
| type, timeToLive | trOptions object | Transaction behavior |
| qrFormat, qrBorder, etc. | qrOptions object | QR code settings (when type=QR) |
| barFormat, barModuleWidth, etc. | barOptions object | Barcode settings (when type=BARCODE) |

Available Tools

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#### payware_generate_code_example
Advanced multi-language code generation with framework support

Supports 60+ operations across all partner types:
- Transactions: create_transaction, get_transaction_status, cancel_transaction, process_transaction, get_transaction_history, simulate_callback
- Products: create_product, get_product, update_product, delete_product, list_products, get_product_image, create_schedule, update_schedule, delete_schedule, list_schedules
- OAuth2 (ISV only): obtain_token, get_token_info, create_token_simple, refresh_token, revoke_token, list_active_tokens
- Data: generate_report, get_report_status, export_report, download_export, cancel_report, list_reports, get_analytics_summary, create_custom_report
- Deep Links: get_transaction_link, get_product_link, create_custom_link, delete_transaction_link, delete_product_link, list_active_links, get_link_analytics, create_batch_links
- P2P (Payment Institution): initiate_p2p_transfer, accept_p2p_transfer, reject_p2p_transfer, get_p2p_transfer_status, list_p2p_transfers, cancel_p2p_transfer, create_p2p_link, get_p2p_analytics
- Soundbites (Payment Institution): register_audio, get_audio, update_audio, delete_audio, list_audios, create_soundbite_transaction, stream_audio, download_audio, get_soundbite_analytics, create_audio_playlist, get_audio_preview

#### payware_generate_documentation
Comprehensive documentation generator

Generates complete API documentation with working code examples for any partner type and programming language combination.

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#### payware_authentication_generate_rsa_keys
Generate RSA key pair for API authentication.

Parameters:
- keySize (optional): RSA key size in bits (default: 2048)

#### payware_authentication_create_jwt_token
Create JWT token for API authentication.

Parameters:
- partnerId (required): Partner ID from payware
- privateKey (required): RSA private key in PEM format

#### payware_authentication_validate_jwt
Validate JWT token format and signature.

Parameters:
- token (required): JWT token to validate
- partnerId (required): Partner ID for validation

#### payware_authentication_test_jwt
Test JWT token with payware API.

Parameters:
- token (required): JWT token to test
- partnerId (required): Partner ID

#### payware_authentication_setup_sandbox_auth
Setup sandbox authentication configuration.

Parameters:
- partnerId (required): Partner ID from payware
- privateKey (optional): Private key for validation

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#### Transaction Status Overview

payware transactions can have the following statuses:

ACTIVE Status:
- ⏳ ACTIVE: Active transaction pending processing or finalizing
- This is the only status returned by payware_transactions_get_transaction_status
- Use GET /transactions/{id} endpoint

Final Statuses:
- ✅ CONFIRMED: Successfully finalized
- ❌ DECLINED: Declined by the user, processing or finalizing payment institutions
- 💥 FAILED: Failed due to technical reasons or other
- ⏰ EXPIRED: Time to live of the transaction has passed
- 🚫 CANCELLED: Transaction canceled by the originator

These final statuses are only available through payware_operations_get_transaction_history using GET /transactions-history/{id} endpoint.

#### payware_operations_create_transaction
Create a new transaction with full API structure support.

Key Parameters:
- currency (required): ISO 3-character code (EUR, USD, GBP, etc.)
- reasonL1 (required): Transaction description (max 100 chars)
- partnerId (required): Partner ID from payware dashboard
- privateKey (required): RSA private key for JWT signing
- amount (optional): Currency value (default: "0.00" for flexible amounts)
- type (optional): PLAIN, QR, or BARCODE (default: PLAIN)
- timeToLive (optional): Payment timeout in seconds, 60-600 (default: 120)

QR Options (when type=QR):
- qrFormat: PNG, SVG, JPG, GIF, BMP (default: SVG)
- qrErrorCorrection: LOW, MEDIUM, QUARTILE, HIGH (default: QUARTILE)
- qrScale, qrBorder, qrVersion: Size and appearance settings

Barcode Options (when type=BARCODE):
- barFormat: PNG, SVG, JPG (default: SVG)
- barModuleWidth, barBarHeight, barFontSize: Size settings

#### payware_operations_get_transaction_status
Get status of ACTIVE transactions only. For completed/finalized transactions use history tool.

Parameters:
- transactionId (required): Transaction ID (starts with 'pw')
- partnerId (required): Partner ID
- privateKey (required): Private key for JWT signing

#### payware_operations_simulate_callback
Simulate callback scenarios for testing.

Parameters:
- transactionId (required): Transaction ID
- status (optional): CONFIRMED, DECLINED, FAILED, EXPIRED, or CANCELLED (default: CONFIRMED)
- callbackUrl (optional): URL where callback would be sent
- amount (optional): Transaction amount (default: 10.00)
- currency (optional): Currency (default: EUR)
- type (optional): Transaction type (default: PLAIN)

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#### payware_generate_code_example
Generate production-ready code examples for any payware operation.

Parameters:
- operation (required): Operation to generate - see complete list below
- language (optional): python, nodejs, php, java, csharp, curl (default: python)
- partner_type (optional): merchant, isv, payment_institution (default: merchant)
- include_comments (optional): Include detailed code comments (default: true)
- include_error_handling (optional): Include comprehensive error handling (default: true)

Available Operations by Category:

Authentication:
- authentication - JWT authentication setup

Transaction Operations (all partner types):
- create_transaction - Create a new payment transaction
- get_transaction_status - Get transaction status and details
- process_transaction - Process a pending transaction
- cancel_transaction - Cancel a pending transaction

Product Operations (merchant, isv):
- create_product - Create a new product
- get_product - Get product details
- list_products - List all products

POI Operations (isv):
- set_price - Set price on a Point of Interaction device
- cancel_price - Cancel active price on POI
- get_poi - Get POI details
- get_poi_status - Get POI transaction status
- get_poi_qrcode - Generate QR code for POI
- list_pois - List all POIs for a merchant

OAuth2 Operations (isv only):
- obtain_token - Obtain OAuth2 access token
- get_token_info - Get OAuth2 token information

Data Operations (all partner types):
- generate_report - Generate analytics report
- get_report_status - Get report generation status

P2P Operations (payment_institution only):
- initiate_p2p_transfer - Initiate peer-to-peer transfer
- accept_p2p_transfer - Accept P2P transfer

Deep Links (all partner types):
- get_transaction_link - Get deep link for transaction

Soundbites (payment_institution only):
- register_audio - Register audio content for soundbite transactions

#### payware_generate_documentation
Generate comprehensive API documentation with code examples.

Parameters:
- language (optional): Target programming language (default: python)
- partnerType (optional): merchant, isv, payment_institution (default: merchant)
- includeScenarios (optional): Include real-world integration scenarios (default: true)
- outputFormat (optional): markdown, html, json (default: markdown)

#### payware_utils_format_request
Format and validate API requests with deterministic JSON serialization for SHA-256 consistency.

Parameters:
- type (required): transaction, headers, or curl
- data (optional): Data to format
- jwtToken (optional): JWT token for headers
- signature (optional): Request signature
- endpoint (optional): API endpoint for curl
- method (optional): HTTP method (default: POST)

#### payware_utils_format_json_deterministic
Format JSON with deterministic property ordering for consistent SHA-256 calculation.

Parameters:
- data (required): Object to serialize
- minimize (optional): Remove whitespace (default: true)

#### payware_utils_server_info
Get MCP server information and configuration.

Note: All transaction data is serialized using consistent property ordering to prevent content hash mismatch errors.

Dependencies

- @modelcontextprotocol/sdk: MCP server framework
- axios: HTTP client for API calls
- jsonwebtoken: JWT token creation
- node-forge: RSA key generation

Environment

- Sandbox Only: All API calls are restricted to sandbox environment
- Base URL: https://sandbox.payware.eu/api/v1
- Supported Currencies: EUR, USD, GBP
- Supported Transaction Types: PLAIN, QR, BARCODE

Security

⚠️ Important Security Notes:

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- REQUIRED: Use environment variables for all credentials
- Never commit .env files to version control
- Use different credentials for development and production
- Store private key files outside web-accessible directories

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- Generate separate key pairs for sandbox and production
- Store private keys with restricted file permissions (600)
- Never embed private keys in source code
- Rotate keys regularly according to security policies

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- This server is designed for sandbox testing only
- Never use sandbox keys in production environment
- Implement proper error handling in production
- Use HTTPS for all API communications
- Validate all input parameters
- Implement rate limiting and monitoring

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⚠️ CRITICAL: payware API requires deterministic JSON serialization for SHA-256 calculation

- Property Order: JSON objects must have consistent property ordering
- Minimized Format: No whitespace or formatting in request bodies
- SHA-256 Calculation: Must be calculated from the exact same JSON string sent to API
- Implementation: This server uses deterministic JSON serialization to ensure consistency

Example of correct JSON format:
`json
{"trData":{"amount":"25.50","currency":"EUR","reasonL1":"Payment description"},"trOptions":{"timeToLive":300,"type":"PLAIN"}}
`

Why this matters:
- Different property orders produce different SHA-256 hashes
- Hash mismatch results in ERR_INVALID_CONTENT_HASH errors
- Server validates that JWT contentSha256 matches request body SHA-256

Troubleshooting

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1. Authentication Failed (ERR_INVALID_SIGNATURE)
- Root Cause: Public key registered with payware doesn't match your private key
- Solution: Ensure the public key registered on payware site corresponds to your private key
- Verification: Use openssl rsa -in privateKey.pem -pubout to extract public key from private key
- Status: ✅ Resolved - Keys must be properly registered on payware partner portal

2. Content Hash Mismatch Error (ERR_INVALID_CONTENT_HASH)
- Root Cause: Inconsistent JSON property ordering
- Solution: Use deterministic JSON serialization (implemented in this server)
- Symptoms: Server logs show different expected vs actual SHA-256 hashes
- Prevention: Always use createMinimizedJSON() from /src/core/utils/json-serializer.js
- Status: ✅ Fixed - Deterministic JSON serialization implemented

3. Transaction Creation Failed
- Ensure all required parameters are provided
- Check amount is non-negative
- Verify transaction type is supported
- Status: ✅ Working - Create and cancel operations confirmed functional

4. MCP Connection Issues
- Ensure server is started with npm start
- Check that MCP client is properly configured
- Verify no firewall blocking stdio communication
- Note: Use MCP Inspector (npm run inspector) for debugging

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HTTP Proxy Server (npm run proxy):
- Bridges MCP tools to HTTP REST API
- Useful for testing tools via HTTP requests
- Documentation: README-proxy.md

MCP Bridge (npm run bridge):
- Connects MCP server to MCP Inspector
- Essential for debugging and development
- Use with: npm run inspector`

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✅ Confirmed Working Operations:
- JWT token creation with RS256 algorithm
- Transaction creation (POST /api/transactions)
- Transaction cancellation (PATCH /api/transactions/{id})
- Deterministic JSON serialization for SHA-256 consistency
- Public/private key pair validation

🧪 Test Results:
- All MCP tools tested successfully with real payware sandbox API
- Both create and cancel transaction flows working end-to-end
- Signature validation resolved with proper key registration

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For issues related to:
- MCP Server: Check server logs and MCP client configuration
- payware API: Refer to payware documentation and sandbox status
- Integration: Use code examples and formatting tools provided
- Key Issues: Ensure public key is registered on payware partner portal

License

MIT License