Moadian SDK

A clean and simple Python SDK for interacting with the Iranian Tax Organization's Moadian API.

Features

• ✅ Simple, intuitive API
• ✅ Automatic Tax ID generation
• ✅ Automatic invoice encryption and signing
• ✅ Date-based serial number management (resets daily)
• ✅ Optional serial storage (file or manual)
• ✅ Rate limiting
• ✅ Complete type hints
• ✅ Comprehensive error handling
• ✅ Server-friendly (no file writes by default)
• ✅ UnitCode enum for measurement units
• ✅ Header parameter overrides

Installation

pip install -e .

Quick Start

from moadian_sdk import MoadianClient, InvoiceData, InvoiceItem, UnitCode

# Initialize client
client = MoadianClient(
    client_id="YOUR_FISCAL_ID",
    certs_dir="certs"
)

# Create invoice items
items = [
    InvoiceItem(
        sstid="1234567890123",
        sstt="Product Name",
        amount=1.0,
        unit_fee=100000.0,
        vat_rate=9.0,
        mu=UnitCode.NUMBER,  # Measurement unit
    )
]

# Create invoice data
invoice_data = InvoiceData(
    seller_tin="YOUR_TAX_ID",
    buyer_tin="BUYER_TAX_ID",
    items=items,
    settlement_method=1,  # 1 = Cash, 2 = Credit
)

# Send invoice (SDK handles everything!)
with client:
    response = client.send_invoice(invoice_data)
    print(f"Invoice sent! UID: {response.uid}")
    print(f"Tax ID: {response.tax_id}")
    print(f"Serial: {response.serial}")

How It Works

The SDK handles the complete invoice submission process:

1. Serial Number Generation: Automatically generates sequential serial numbers (resets daily)
2. Tax ID Generation: Creates unique Tax ID using fiscal ID, date, and serial number
3. Invoice Building: Constructs invoice dictionary according to Moadian specification
4. Encryption: Signs with JWS (RS256) and encrypts with JWE (RSA-OAEP-256 + AES256-GCM)
5. Submission: Sends encrypted invoice to Moadian API
6. Response: Returns invoice response with UID, reference number, Tax ID, and serial number

Examples

Example 1: Basic Invoice

from moadian_sdk import MoadianClient, InvoiceData, InvoiceItem, UnitCode

client = MoadianClient(
    client_id="YOUR_FISCAL_ID",
    certs_dir="certs",
    enable_serial_storage=False,
)

# Create invoice items
items = [
    InvoiceItem(
        sstid="1234567890123",
        sstt="محصول نمونه",
        amount=2.0,
        unit_fee=100000.0,
        vat_rate=9.0,
        discount=5000.0,
        mu=UnitCode.NUMBER,
    )
]

# Create invoice data
invoice_data = InvoiceData(
    seller_tin="1234567890",
    buyer_tin="0987654321",
    items=items,
    settlement_method=1,  # Cash
)

# Send invoice
with client:
    response = client.send_invoice(invoice_data)
    print(f"✅ Invoice sent! UID: {response.uid}")
    print(f"   Tax ID: {response.tax_id}")
    print(f"   Serial: {response.serial}")

Example 2: Using UnitCode Enum

from moadian_sdk import MoadianClient, InvoiceData, InvoiceItem, UnitCode

client = MoadianClient(
    client_id="YOUR_FISCAL_ID",
    certs_dir="certs",
)

# Create items with different measurement units
items = [
    InvoiceItem(
        sstid="PROD001",
        sstt="محصول بر اساس کیلوگرم",
        amount=5.0,
        unit_fee=50000.0,
        mu=UnitCode.KILOGRAM,  # Using enum
    ),
    InvoiceItem(
        sstid="PROD002",
        sstt="محصول بر اساس متر",
        amount=10.0,
        unit_fee=20000.0,
        mu=UnitCode.METER,  # Using enum
    ),
    InvoiceItem(
        sstid="PROD003",
        sstt="محصول بر اساس عدد (پیش‌فرض)",
        amount=3.0,
        unit_fee=15000.0,
        # mu defaults to UnitCode.NUMBER
    ),
]

invoice_data = InvoiceData(
    seller_tin="1234567890",
    buyer_tin="0987654321",
    items=items,
)

# You can also use string or int codes
item_with_string = InvoiceItem(
    sstid="PROD004",
    sstt="محصول با کد رشته‌ای",
    amount=1.0,
    unit_fee=10000.0,
    mu="164",  # String code
)

item_with_int = InvoiceItem(
    sstid="PROD005",
    sstt="محصول با کد عددی",
    amount=1.0,
    unit_fee=10000.0,
    mu=164,  # Integer code
)

# Find UnitCode by code or Persian name
unit_by_code = UnitCode.from_code(164)
if unit_by_code:
    print(f"Code 164: {unit_by_code.name} = {unit_by_code.persian_name}")

unit_by_name = UnitCode.from_persian("کیلوگرم")
if unit_by_name:
    print(f"Persian 'کیلوگرم': {unit_by_name.name} = {unit_by_name.code}")

Example 3: Invoice with All Optional Fields

from moadian_sdk import MoadianClient, InvoiceData, InvoiceItem, UnitCode

client = MoadianClient(
    client_id="YOUR_FISCAL_ID",
    certs_dir="certs",
)

# Create item with all optional fields
items = [
    InvoiceItem(
        sstid="1234567890123",
        sstt="محصول کامل با تمام فیلدها",
        amount=2.0,
        unit_fee=100000.0,
        vat_rate=9.0,
        discount=10000.0,
        mu=UnitCode.NUMBER,
        nw=1.5,  # Net weight
        cfee=1000.0,  # Currency fee
        cut="USD",  # Currency unit type
        exr=42000.0,  # Exchange rate
        ssrv=200000.0,  # Service/Product sale rate value
        sscv=200000.0,  # Service/Product sale currency value
        vba=180000.0,  # VAT base amount
        odt="DISCOUNT_TYPE",  # Other discount type
        odr=5.0,  # Other discount rate
        odam=5000.0,  # Other discount amount
        olt="LEVY_TYPE",  # Other levy type
        olr=2.0,  # Other levy rate
        olam=2000.0,  # Other levy amount
        consfee=10000.0,  # Construction fee
    )
]

invoice_data = InvoiceData(
    seller_tin="1234567890",
    buyer_tin="0987654321",
    items=items,
    settlement_method=1,
    invoice_type=1,
    invoice_pattern=1,
    invoice_subject=1,
)

with client:
    response = client.send_invoice(invoice_data)

Example 4: Header Parameter Overrides

from moadian_sdk import MoadianClient, InvoiceData, InvoiceItem

client = MoadianClient(
    client_id="YOUR_FISCAL_ID",
    certs_dir="certs",
)

items = [
    InvoiceItem(
        sstid="1234567890123",
        sstt="محصول نمونه",
        amount=1.0,
        unit_fee=100000.0,
    )
]

invoice_data = InvoiceData(
    seller_tin="1234567890",
    buyer_tin="0987654321",
    items=items,
    settlement_method=1,  # Default: Cash
)

# Override header parameters when sending
with client:
    response = client.send_invoice(
        invoice_data,
        # Override settlement method to Credit
        settlement_method=2,
        # Override type of business
        tob=3,
        # Add related tax ID
        irtaxid="RELATED123456",
        # Add other header fields
        tax17=1000.0,
        tinc="TAX_ID_CODE",
        lno="LICENSE123",
        # ... any other header parameter from build_invoice_dict()
    )

Example 5: Credit Settlement with Payments

from moadian_sdk import MoadianClient, InvoiceData, InvoiceItem

client = MoadianClient(
    client_id="YOUR_FISCAL_ID",
    certs_dir="certs",
)

items = [
    InvoiceItem(
        sstid="1234567890123",
        sstt="محصول با تسویه اعتباری",
        amount=1.0,
        unit_fee=100000.0,
    )
]

invoice_data = InvoiceData(
    seller_tin="1234567890",
    buyer_tin="0987654321",
    items=items,
    settlement_method=2,  # Credit
)

# For credit invoices, you can provide payment information
payments = [
    {
        "iinn": "INSTRUMENT_ID",
        "acn": "ACCOUNT_NUMBER",
        "trmn": "TERMINAL_NUMBER",
        "pmt": 1,  # Payment method
        "trn": "TRANSACTION_NUMBER",
        "pcn": "PAYMENT_CARD_NUMBER",
        "pid": "PAYMENT_ID",
        "pdt": 1704067200000,  # Payment date timestamp
        "pv": 100000.0,  # Payment value
    }
]

with client:
    response = client.send_invoice(
        invoice_data,
        payments=payments,
    )

Example 6: Multiple Items

from moadian_sdk import MoadianClient, InvoiceData, InvoiceItem

client = MoadianClient(
    client_id="YOUR_FISCAL_ID",
    certs_dir="certs",
)

# Create multiple items
items = [
    InvoiceItem(
        sstid="PROD001",
        sstt="محصول اول",
        amount=2.0,
        unit_fee=50000.0,
        vat_rate=9.0,
        discount=5000.0,
    ),
    InvoiceItem(
        sstid="PROD002",
        sstt="محصول دوم",
        amount=3.0,
        unit_fee=75000.0,
        vat_rate=9.0,
        discount=10000.0,
    ),
    InvoiceItem(
        sstid="PROD003",
        sstt="محصول سوم",
        amount=1.0,
        unit_fee=100000.0,
        vat_rate=9.0,
        discount=0.0,
    ),
]

invoice_data = InvoiceData(
    seller_tin="1234567890",
    buyer_tin="0987654321",
    items=items,
)

with client:
    response = client.send_invoice(invoice_data)
    print(f"Total items: {len(items)}")
    print("Invoice totals calculated automatically")

Example 7: Error Handling

from moadian_sdk import MoadianClient, InvoiceData, InvoiceItem, MoadianException

client = MoadianClient(
    client_id="YOUR_FISCAL_ID",
    certs_dir="certs",
)

items = [
    InvoiceItem(
        sstid="1234567890123",
        sstt="محصول نمونه",
        amount=1.0,
        unit_fee=100000.0,
    )
]

invoice_data = InvoiceData(
    seller_tin="1234567890",
    buyer_tin="0987654321",
    items=items,
)

try:
    with client:
        response = client.send_invoice(invoice_data)
        print("✅ Success:", response.uid)
except MoadianException as e:
    print(f"❌ Moadian Error: {e}")
except Exception as e:
    print(f"❌ Unexpected Error: {e}")

Example 8: Manual Serial Storage (Server Environment)

from moadian_sdk import MoadianClient, InvoiceData, InvoiceItem
import json
import datetime

client = MoadianClient(
    client_id="YOUR_FISCAL_ID",
    certs_dir="certs",
    enable_serial_storage=False,  # No file writes
)

items = [
    InvoiceItem(
        sstid="1234567890123",
        sstt="Product Name",
        amount=1.0,
        unit_fee=100000.0,
    )
]

invoice_data = InvoiceData(
    seller_tin="YOUR_TAX_ID",
    buyer_tin="BUYER_TAX_ID",
    items=items,
)

with client:
    response = client.send_invoice(invoice_data)

    # Store manually in your database/file
    invoice_record = {
        "uid": response.uid,
        "tax_id": response.tax_id,      # IMPORTANT: Store this!
        "serial": response.serial,       # IMPORTANT: Store this!
        "reference_number": response.reference_number,
        "timestamp": datetime.datetime.now().isoformat(),
    }

    # Save to database
    # db.insert("invoices", invoice_record)

    # Or save to file
    with open("invoices.json", "a") as f:
        json.dump(invoice_record, f)
        f.write("\n")

Example 9: File-Based Serial Storage

from moadian_sdk import MoadianClient, InvoiceData, InvoiceItem

# Enable automatic serial storage to file
client = MoadianClient(
    client_id="YOUR_FISCAL_ID",
    certs_dir="certs",
    enable_serial_storage=True,  # Enable file storage
    serial_file="last_serial.txt",  # Custom file path (optional)
)

items = [
    InvoiceItem(
        sstid="1234567890123",
        sstt="Product Name",
        amount=1.0,
        unit_fee=100000.0,
    )
]

invoice_data = InvoiceData(
    seller_tin="1234567890",
    buyer_tin="0987654321",
    items=items,
)

# Serial numbers will be automatically saved to file
with client:
    response = client.send_invoice(invoice_data)
    # Serial automatically saved to last_serial.txt

Example 10: Check Invoice Status

from moadian_sdk import MoadianClient, InvoiceData, InvoiceItem

client = MoadianClient(
    client_id="YOUR_FISCAL_ID",
    certs_dir="certs",
)

items = [
    InvoiceItem(
        sstid="1234567890123",
        sstt="Product Name",
        amount=1.0,
        unit_fee=100000.0,
    )
]

invoice_data = InvoiceData(
    seller_tin="1234567890",
    buyer_tin="0987654321",
    items=items,
)

with client:
    response = client.send_invoice(invoice_data)

    # Check status
    status_list = client.inquiry_by_uid([response.uid])
    if status_list:
        status = status_list[0].get("status")
        print(f"Status: {status}")

        if status == "SUCCESS":
            print("Invoice accepted!")
        elif status == "FAILED":
            errors = status_list[0].get("data", {}).get("error", [])
            for err in errors:
                print(f"Error: {err['message']}")

Serial Number Storage Options

The SDK provides two modes for handling serial numbers:

Option 1: Automatic File Storage (Default: Disabled)

When enable_serial_storage=True, the SDK automatically saves serial numbers to a text file:

client = MoadianClient(
    client_id="YOUR_FISCAL_ID",
    enable_serial_storage=True,  # Enable automatic file storage
    serial_file="last_serial.txt"  # Optional: custom file path
)

How it works:

• Serial numbers are stored in last_serial.txt (or custom file)
• Format: YYYY-MM-DD:serial_number (date-based, resets daily)
• Automatically loads last serial for today on startup
• Automatically saves after each invoice submission
• File format example:

  # Date-based serial numbers (YYYY-MM-DD:serial)
  2024-01-15:42
  2024-01-14:150
  2024-01-13:89
  

Use when:

• You have write access to the filesystem
• You want automatic persistence across restarts
• Single-instance application

Option 2: Manual Storage (Default: Enabled)

When enable_serial_storage=False (default), the SDK uses in-memory serial management:

client = MoadianClient(
    client_id="YOUR_FISCAL_ID",
    enable_serial_storage=False  # Default - no file writes
)

How it works:

• Serial numbers are managed in-memory only
• Resets to 0 each day automatically
• You must store serial and tax_id manually after each invoice
• Serial numbers reset on application restart

Use when:

• Server environments without write access
• Multi-instance applications (load-balanced)
• You want to store serials in your database
• You need custom storage logic

Certificate Setup

Place your certificates in a certs/ directory:

certs/
├── private_key.pem      # Private key (PEM format)
└── certificate.pem      # Certificate (PEM format)

The SDK will automatically find these files. If you use different filenames:

client = MoadianClient(
    client_id="YOUR_FISCAL_ID",
    certs_dir="certs",
    private_key_file="my_key.pem",
    certificate_file="my_cert.pem",
)

API Reference

MoadianClient

Main client class for interacting with Moadian API.

Initialization

MoadianClient(
    client_id: str,                          # Required: Fiscal memory ID
    certs_dir: str = "certs",                # Certificate directory
    private_key_file: str = "private_key.pem",
    certificate_file: str = "certificate.pem",
    password: Optional[bytes] = None,        # Private key password
    enable_serial_storage: bool = False,     # Enable file storage (default: False)
    serial_file: str = "last_serial.txt",   # Serial file path
)

Methods

• send_invoice(invoice_data, force_serial=None, min_delay=15.0, **header_overrides) - Send invoice (high-level)

  • Returns: InvoiceResponse with uid, reference_number, tax_id, serial
  • Handles: Tax ID generation, encryption, submission
  • **header_overrides: Optional keyword arguments to override header/invoice parameters
    • Any parameter accepted by build_invoice_dict() can be passed here
    • Examples: settlement_method, tob, irtaxid, tax17, tinc, lno, etc.

• send_invoices(invoices, tax_id=None, serial=None) - Send invoices (low-level)

  • For advanced use cases

• get_server_information() - Get server info and public keys

  • Returns: ServerInfo object

• inquiry_by_uid(uid_list, fiscal_id=None) - Check invoice status by UID

  • Returns: List of status dictionaries

• inquiry_by_reference_id(reference_ids) - Check invoice status by reference

  • Returns: List of status dictionaries

• inquiry_by_time_range(start, end, page_number=1, page_size=10, status=None) - Query invoices by date range

• get_fiscal_information(memory_id) - Get fiscal memory information

• get_taxpayer_information(economic_code) - Get taxpayer information

Models

InvoiceResponse

@dataclass
class InvoiceResponse:
    uid: str                    # Invoice UID (requestTraceId)
    reference_number: str      # Moadian reference number
    tax_id: str                # Generated Tax ID (22 characters)
    serial: int                # Serial number (decimal format)
    packet_type: Optional[str]
    data: Optional[Any]

InvoiceData

@dataclass
class InvoiceData:
    seller_tin: str            # Seller Tax ID
    buyer_tin: str             # Buyer Tax ID
    items: List[InvoiceItem]   # Invoice items
    settlement_method: int = 1  # 1=Cash, 2=Credit
    invoice_type: int = 1
    invoice_pattern: int = 1
    invoice_subject: int = 1

InvoiceItem

@dataclass
class InvoiceItem:
    sstid: str                 # Service/Product ID
    sstt: str                  # Service/Product Title
    amount: float              # Quantity (double)
    unit_fee: float            # Unit price (double)
    vat_rate: float = 10.0     # VAT rate percentage (double)
    discount: float = 0.0       # Discount amount (double)
    mu: Union[UnitCode, str, int] = None  # Measurement unit (default: UnitCode.NUMBER)

    # Optional fields
    nw: Optional[float] = None          # Net weight
    cfee: Optional[float] = None        # Currency fee
    cut: Optional[str] = None           # Currency unit type
    exr: Optional[float] = None         # Exchange rate
    ssrv: Optional[float] = None        # Service/Product sale rate value
    sscv: Optional[float] = None        # Service/Product sale currency value
    vba: Optional[float] = None         # VAT base amount
    odt: Optional[str] = None           # Other discount type
    odr: Optional[float] = None         # Other discount rate
    odam: Optional[float] = None        # Other discount amount
    olt: Optional[str] = None           # Other levy type
    olr: Optional[float] = None          # Other levy rate
    olam: Optional[float] = None        # Other levy amount
    consfee: Optional[float] = None     # Construction fee

UnitCode

Enumeration for measurement units (واحدهای سنجش):

class UnitCode(Enum):
    NUMBER = (1612, "عدد")           # Default
    KILOGRAM = (164, "کیلوگرم")
    METER = (1627, "متر")
    LITER = (1637, "لیتر")
    # ... and many more

    # Methods
    @classmethod
    def from_code(cls, code: int) -> Optional[UnitCode]

    @classmethod
    def from_persian(cls, persian_name: str) -> Optional[UnitCode]

InvoiceStatus

class InvoiceStatus(Enum):
    SUCCESS = "SUCCESS"
    FAILED = "FAILED"
    IN_PROGRESS = "IN_PROGRESS"
    NOT_FOUND = "NOT_FOUND"
    TIMEOUT = "TIMEOUT"

Important Notes

Serial Number Management

• Serial numbers reset daily - Each day starts from 0 (or 1)
• Must be unique per day - The SDK ensures this automatically
• Storage is optional - Choose based on your environment:
  • File storage: Use when you have write access and single instance
  • Manual storage: Use in server environments or multi-instance setups

Tax ID and Serial Storage

When enable_serial_storage=False (default):

• You MUST store tax_id and serial from the response
• These are critical for invoice tracking and compliance
• Store them in your database or file system
• The SDK provides these values in InvoiceResponse for your convenience

When enable_serial_storage=True:

• Serial numbers are automatically saved to file
• You should still store tax_id for your records
• Serial file format: YYYY-MM-DD:serial_number

Server Environments

For production server environments:

1. Set enable_serial_storage=False (default)
2. Store tax_id and serial in your database after each invoice
3. Use your database to track serial numbers if needed
4. The SDK handles serial generation, you handle persistence

Measurement Units

The SDK provides a UnitCode enum for measurement units. You can:

• Use the enum directly: mu=UnitCode.KILOGRAM
• Use string codes: mu="164"
• Use integer codes: mu=164
• Find by code: UnitCode.from_code(164)
• Find by Persian name: UnitCode.from_persian("کیلوگرم")

Default measurement unit is UnitCode.NUMBER (1612, "عدد").

Header Parameter Overrides

You can override any header parameter when sending an invoice:

response = client.send_invoice(
    invoice_data,
    settlement_method=2,  # Override to Credit
    tob=3,                # Override type of business
    irtaxid="RELATED123", # Add related tax ID
    tax17=1000.0,         # Add tax17
    # ... any other header parameter
)

Error Handling

The SDK raises custom exceptions:

• MoadianException - Base exception
• AuthenticationException - Authentication failures
• APIException - API errors
• CertificateException - Certificate loading errors
• InvoiceException - Invoice generation errors

from moadian_sdk import MoadianClient, MoadianException, AuthenticationException

try:
    with client:
        response = client.send_invoice(invoice_data)
except AuthenticationException as e:
    print(f"Auth failed: {e}")
except MoadianException as e:
    print(f"Error: {e}")

Project Structure

moadian-sdk/
├── moadian_sdk/          # SDK package
│   ├── __init__.py       # Public API
│   ├── client.py         # Main API client
│   ├── crypto.py         # Encryption/signing
│   ├── invoice.py        # Invoice building & Tax ID generation
│   ├── models.py         # Data models
│   ├── exceptions.py     # Custom exceptions
│   └── utils.py          # Certificate utilities
├── example.py            # Comprehensive examples
├── pyproject.toml        # Project configuration
└── README.md            # This file

License

MIT