bpost-address-validator 0.1.3

Python wrapper for bpost External Mailing Address Proofing API with pydantic models and httpx sync/async clients.

bpost-address-validator

This is a lightweight Python wrapper for bpost’s External Mailing Address Proofing API endpoint POST /<env>/externalMailingAddressProofingRest/validateAddresses.

Environments have different base URLs and path prefixes. Presets are provided for convenience:

• prod: https://api.mailops.bpost.cloud/roa-info/...
• test (NP): https://api.mailops-np.bpost.cloud/roa-info-st2/...
• uat (NP): https://api.mailops-np.bpost.cloud/roa-info-ac/...

It provides:

• Synchronous and asynchronous clients powered by httpx
• Pydantic v2 models for request/response envelopes (flexible inner structure; extra fields allowed)
• A simple, typed interface and explicit error handling via ApiError

Features

• Sync client: BpostClient
• Async client: AsyncBpostClient
• Automatic x-api-key header handling
• Default base URL pointing to bpost NP environment (you should usually provide a preset explicitly)
• Uniform error type ApiError for transport and non-200 responses

Requirements

• Python 3.12+

Installation

pip install bpost-address-validator

From source (editable):

pip install -e .

Quick start (sync)

from bpost_address_validator import (
    BpostClient,
    ValidateAddressesRequest,
    ValidateAddressesRequestContent,
    AddressToValidateList,
    AddressToValidate,
    ValidateAddressOptions,
    PostalAddress,
    DeliveryPointLocation,
    StructuredDeliveryPointLocation,
    PostalCodeMunicipality,
    StructuredPostalCodeMunicipality,
)

req = ValidateAddressesRequest(
    validate_addresses_request=ValidateAddressesRequestContent(
        address_to_validate_list=AddressToValidateList(
            address_to_validate=[
                AddressToValidate(
                    id="1",
                    dispatching_country_iso_code="BE",
                    delivering_country_iso_code="BE",
                    # Provide either address_block_lines or a structured postal_address
                    postal_address=PostalAddress(
                        delivery_point_location=DeliveryPointLocation(
                            structured_delivery_point_location=StructuredDeliveryPointLocation(
                                street_name="Muntstraat",
                                street_number="1",
                            )
                        ),
                        postal_code_municipality=PostalCodeMunicipality(
                            structured_postal_code_municipality=StructuredPostalCodeMunicipality(
                                postal_code="1000",
                                municipality_name="Bruxelles",
                            )
                        ),
                    ),
                )
            ]
        ),
        validate_address_options=ValidateAddressOptions(
            include_submitted_address=True,
            include_suggestions=True,
            include_formatting=True,
        ),
    )
)

# Use a preset matching your target environment: "prod", "test", or "uat"
with BpostClient(api_key="<YOUR_API_KEY>", preset="test") as client:
    resp = client.validate_addresses(req)
    print(resp.model_dump())

Quick start (async)

import asyncio
from bpost_address_validator import (
    AsyncBpostClient,
    ValidateAddressesRequest,
    ValidateAddressesRequestContent,
    AddressToValidateList,
    AddressToValidate,
)

async def main():
    req = ValidateAddressesRequest(
        validate_addresses_request=ValidateAddressesRequestContent(
            address_to_validate_list=AddressToValidateList(
                address_to_validate=[
                    AddressToValidate(
                        id="1",
                        dispatching_country_iso_code="BE",
                        delivering_country_iso_code="BE",
                    )
                ]
            )
        )
    )
    async with AsyncBpostClient(api_key="<YOUR_API_KEY>", preset="test") as client:
        resp = await client.validate_addresses(req)
        print(resp.model_dump())

asyncio.run(main())

Environment configuration

You can configure the target environment in three ways:

1. Use a preset (recommended):

# prod
BpostClient(api_key="...", preset="prod")

# test (NP, st2)
BpostClient(api_key="...", preset="test")

# uat (NP, ac)
BpostClient(api_key="...", preset="uat")

2. Manually set base URL and path prefix:

# Equivalent to preset="prod"
BpostClient(
    api_key="...",
    base_url="https://api.mailops.bpost.cloud",
    environment="roa-info",
)

# Equivalent to preset="test"
BpostClient(
    api_key="...",
    base_url="https://api.mailops-np.bpost.cloud",
    environment="roa-info-st2",
)

# Equivalent to preset="uat"
BpostClient(
    api_key="...",
    base_url="https://api.mailops-np.bpost.cloud",
    environment="roa-info-ac",
)

3. Advanced: Provide your own httpx client with custom base URL and headers. In that case, pass client= to the constructor and omit api_key or headers accordingly.

Using the typed address models

from bpost_address_validator import (
    BpostClient,
    ValidateAddressesRequest,
    ValidateAddressesRequestContent,
    AddressToValidateList,
    AddressToValidate,
    ValidateAddressOptions,
    AddressBlockLines,
    UnstructuredAddressLineItem,
    PostalAddress,
    DeliveryPointLocation,
    StructuredDeliveryPointLocation,
    PostalCodeMunicipality,
    StructuredPostalCodeMunicipality,
)

req = ValidateAddressesRequest(
    validate_addresses_request=ValidateAddressesRequestContent(
        address_to_validate_list=AddressToValidateList(
            address_to_validate=[
                AddressToValidate(
                    id="1",
                    dispatching_country_iso_code="BE",
                    delivering_country_iso_code="BE",
                    # Option A: unstructured address lines
                    address_block_lines=AddressBlockLines(
                        unstructured_address_line=[
                            UnstructuredAddressLineItem(body="Muntstraat 1", locale="nl")
                        ]
                    ),
                    # Option B: structured postal address (can be used instead of address_block_lines)
                    postal_address=PostalAddress(
                        delivery_point_location=DeliveryPointLocation(
                            structured_delivery_point_location=StructuredDeliveryPointLocation(
                                street_name="Muntstraat", street_number="1"
                            )
                        ),
                        postal_code_municipality=PostalCodeMunicipality(
                            structured_postal_code_municipality=StructuredPostalCodeMunicipality(
                                postal_code="1000", municipality_name="Bruxelles"
                            )
                        ),
                    ),
                )
            ]
        ),
        validate_address_options=ValidateAddressOptions(include_formatting=True),
    )
)

with BpostClient(api_key="<YOUR_API_KEY>") as client:
    resp = client.validate_addresses(req)
    # Access typed response envelope
    print(resp.validate_addresses_response is not None)

Passing a raw dict payload

from bpost_address_validator import BpostClient

payload = {
    "ValidateAddressesRequest": {
        "AddressToValidateList": {
            "AddressToValidate": [
                {
                    "@id": "1",
                    "DispatchingCountryISOCode": "BE",
                    "DeliveringCountryISOCode": "BE",
                    "PostalAddress": {
                        "DeliveryPointLocation": {
                            "StructuredDeliveryPointLocation": {
                                "StreetName": "Muntstraat",
                                "StreetNumber": "1",
                            }
                        },
                        "PostalCodeMunicipality": {
                            "StructuredPostalCodeMunicipality": {
                                "PostalCode": "1000",
                                "MunicipalityName": "Bruxelles",
                            }
                        },
                    },
                }
            ]
        },
        "ValidateAddressOptions": {"IncludeFormatting": True},
    }
}

with BpostClient(api_key="<YOUR_API_KEY>") as client:
    resp = client.validate_addresses(payload)
    print(resp.validate_addresses_response is not None)

API overview

• Clients

  • BpostClient(api_key: str, base_url: str = DEFAULT, timeout: float | None = 30.0)
    • validate_addresses(payload) -> ValidateAddressesResponse
  • AsyncBpostClient(api_key: str, base_url: str = DEFAULT, timeout: float | None = 30.0)
    • await validate_addresses(payload) -> ValidateAddressesResponse

• Models (selected)

  • ValidateAddressesRequest
  • ValidateAddressesRequestContent
  • AddressToValidateList
  • AddressToValidate
  • AddressBlockLines, UnstructuredAddressLineItem
  • PostalAddress, DeliveryPointLocation, StructuredDeliveryPointLocation
  • PostalCodeMunicipality, StructuredPostalCodeMunicipality
  • ValidateAddressOptions
  • ValidateAddressesResponse

• Errors

  • ApiError — for transport errors and non-200 responses. Inspect status_code and details for context.

Request/Response envelopes

• Request body root: {"ValidateAddressesRequest": {...}}
• Response body root: {"ValidateAddressesResponse": {...}}

Models allow extra fields to preserve forward-compatibility with upstream changes. See externalMailaddressProofingAPI-OpenAPIspec_v3.yaml for the full schema reference.

Environments and base URL

• Default base URL (NP): https://api.mailops-np.bpost.cloud
• Endpoint path: /roa-info-st/externalMailingAddressProofingRest/validateAddresses You can override the base URL in the client constructor.

Error handling

• Transport issues raise ApiError("HTTP transport error").
• Non-200 responses raise ApiError with status_code and parsed details (JSON when available).

Example:

from bpost_address_validator import BpostClient, ApiError

try:
    with BpostClient(api_key="bad-key") as client:
        client.validate_addresses({"ValidateAddressesRequest": {}})
except ApiError as e:
    print(e.status_code, e.details)

Authentication

Provide your API key via the api_key parameter. It is sent as x-api-key automatically.

Typing strategy

• Pydantic v2 models are used for the outer envelopes and key nested structures.
• Public attributes are Pythonic snake_case; JSON aliases match the API (e.g., dispatching_country_iso_code -> DispatchingCountryISOCode).
• Typed models are provided for address_block_lines and postal_address structures (including delivery point location and postal code/municipality).
• Extra keys are allowed across models to avoid breakage if bpost adds new fields.
• For attributes like "@id", the models expose proper field aliases (e.g., Field(alias="@id")).

Development

• Python 3.12+
• Runtime deps: httpx>=0.27.0, pydantic>=2.7.0
• No tests yet — PRs welcome (tests and deeper typed models).

License

MIT — see LICENSE if provided, otherwise follow repository policy.

Disclaimer

This project is not affiliated with or endorsed by bpost. Use at your own risk and comply with bpost’s terms.