Finanfut Billing Python SDK

Client oficial sincrònic per consumir la Finanfut Billing External API (/external/v1) amb models compatibles amb Pydantic v2, ara preparat per treballar amb Business Units.

Instal·lació

• Pydantic 2.x: pip install finanfut-billing-sdk>=2.0
• Pydantic 1.x: pip install finanfut-billing-sdk<2.0
• Des del repositori local: pip install -e backend/sdk

Dependències principals:

• pydantic>=2.0,<3.0
• requests>=2.31

Configuració bàsica i Business Units

from finanfut_billing_sdk import FinanfutBillingClient

client = FinanfutBillingClient(
    base_url="https://api.finanfut-billing.com",
    api_key="sk_live_xxx",
    business_unit_id="bu_default",  # opcional: aplicada a serveis/factures/liquidacions per defecte
    timeout=10,
    max_retries=2,
)

Com funciona business_unit_id

• Global al client: passa business_unit_id al constructor i s'aplicarà automàticament a les operacions compatibles.
• Per operació: pots sobreescriure-la en cada mètode (business_unit_id="bu_alt").
• Endpoints sense BU: tax rates i partner payment methods són d'abast de companyia i ignoren la BU (l'SDK emet un avís si n'hi ha una definida).
• Liquidacions (settlements): la BU és opcional però s'envia quan està disponible per enrutar payouts.
• External API: serveis i factures externes accepten BU però actualment poden ignorar-la; l'SDK ja no la tracta com a obligatòria.

Exemples d'ús

Crear producte/servei amb BU

from decimal import Decimal
from finanfut_billing_sdk.models import ExternalServiceUpsertRequest

payload = ExternalServiceUpsertRequest(
    external_reference="service_abc",
    type="service",
    name="Monthly subscription",
    description="Access to premium content",
    price=Decimal("29.90"),
    vat_rate_code="vat_21",
)
service = client.upsert_service(payload)  # usa la BU global

Crear factura amb BU (sobre-escrivint la BU global)

from finanfut_billing_sdk.models import ExternalInvoiceCreateRequest, ExternalInvoiceLine

invoice = client.create_invoice(
    ExternalInvoiceCreateRequest(
        client_external_reference="client_123",
        currency="EUR",
        lines=[
            ExternalInvoiceLine(
                service_external_reference="service_abc",
                description="Premium plan",
                qty=1,
                price=29.90,
                vat_rate_id="tax_rate_uuid",
            ),
        ],
    ),
    business_unit_id="bu_sales",  # prioritat respecte la BU global
)

Operacions sense BU (àmbit de companyia)

# Els tax rates i partner payment methods ignoren la BU.
client.list_tax_rates()
client.partner_payment_methods.list_partner_payment_methods()

Idempotència en liquidacions

settlement = client.settlements.create_settlement(
    payload,
    idempotency_key="settlement-create-2024-12-31",
)

Enviar factura i registrar pagament

from finanfut_billing_sdk.models import ExternalInvoiceEmailRequest, ExternalPaymentCreateRequest

email = client.send_invoice_email(
    invoice.invoice_id,
    ExternalInvoiceEmailRequest(subject="La teva factura", body="Adjunt trobaràs el PDF"),
)

payment = client.register_payment(
    invoice.invoice_id,
    ExternalPaymentCreateRequest(amount=29.90, method="stripe"),
)

Checkout i onboarding de Stripe Connect

from finanfut_billing_sdk.models import ExternalCheckoutCreateRequest, ExternalConnectOnboardRequest

checkout = client.payments.create_checkout(
    "stripe",
    ExternalCheckoutCreateRequest(
        amount=29.90,
        currency="EUR",
        business_unit_id="bu_sales",
        provider_payload={"payment_method_types": ["card"]},
    ),
)

connect = client.payments.connect_onboard(
    "stripe",
    ExternalConnectOnboardRequest(
        provider_id="provider_uuid",
        return_url="https://app.example.com/connect/return",
        refresh_url="https://app.example.com/connect/refresh",
    ),
)

Checkout sessions de Stripe (external)

from finanfut_billing_sdk.models import ExternalCheckoutSessionCreateRequest

session = client.payments.create_checkout_session(
    ExternalCheckoutSessionCreateRequest(
        amount=49.90,
        currency="EUR",
        success_url="https://app.example.com/ok",
        cancel_url="https://app.example.com/cancel",
        description="Pagament",
    ),
    idempotency_key="checkout-session-2024-12-01",
)

Validació de targeta sense cobrar

from finanfut_billing_sdk.models import PaymentMethodSetupStartRequest, SubscriptionPayer

setup = client.payment_method_setups.start(
    PaymentMethodSetupStartRequest(
        request_id="membership-enrollment-123-card-setup",
        business_unit_id="bu_sports",
        subject_type="membership_enrollment",
        subject_id="enrollment_123",
        billing_client_id="client_uuid",
        payer=SubscriptionPayer(email="payer@example.com", name="Payer One"),
        success_url="https://sports.example.com/memberships/card-ok",
        cancel_url="https://sports.example.com/memberships/card-cancel",
        metadata={"origin": "finanfut-sports"},
    ),
    idempotency_key="membership-enrollment-123-card-setup",
)
print(setup.checkout_url, setup.payment_method_status)

Aquest flux crea un Stripe Checkout mode=setup i no cobra cap import. Per altes pendents d'aprovació, no useu subscriptions.start_subscription() només per validar targeta; espereu el webhook payment_method.saved i creeu/activeu els cobraments posteriors amb el customer i payment method guardats.

Per app nativa amb flutter_stripe, demaneu PaymentSheet sense canviar la font d'integració Stripe:

setup = client.payment_method_setups.start(
    PaymentMethodSetupStartRequest(
        request_id="membership-enrollment-123-card-setup",
        business_unit_id="bu_sports",
        subject_type="membership_enrollment",
        subject_id="enrollment_123",
        billing_client_id="client_uuid",
        payer=SubscriptionPayer(email="payer@example.com", name="Payer One"),
        success_url="https://sports.example.com/memberships/card-ok",
        cancel_url="https://sports.example.com/memberships/card-cancel",
        preferred_checkout_surface="payment_sheet",
        payment_sheet_return_url="finanfut://stripe-redirect",
        metadata={"origin": "finanfut-sports"},
    ),
    idempotency_key="membership-enrollment-123-card-setup",
)

if setup.payment_sheet:
    # Passeu aquests valors directament a initPaymentSheet; no els logueu.
    payment_sheet_config = setup.payment_sheet
else:
    print(setup.checkout_url)

Subscripcions BU

from finanfut_billing_sdk.models import SubscriptionPricingSnapshot, SubscriptionStartRequest

payload = SubscriptionStartRequest(
    request_id="sports-pro-2025-01",
    business_unit_id="bu_sales",
    subject_type="team",
    subject_id="team_123",
    billing_client_id="client_uuid",
    bu_plan_ref="pro_v3",
    pricing_snapshot=SubscriptionPricingSnapshot(
        amount=29.9,
        currency="EUR",
        interval="month",
    ),
    success_url="https://app.example.com/billing/success",
    cancel_url="https://app.example.com/billing/cancel",
)

response = client.subscriptions.start_subscription(payload)

Contractes canònics Sports ↔ Billing

Sports ha d'integrar-se amb Billing a través de finanfut-billing-sdk>=2.1.22. L'endpoint HTTP és el transport intern i la font OpenAPI, però el contracte d'aplicació és client.contracts. Sports no ha de construir JSON manual.

La guia canònica completa és docs/integrations/sports_billing_contracts_v1.md. Aquest README només en resumeix la superfície pública.

Per quotes finites noves, Sports ha d'enviar scheduled_charges ja resolts. No s'ha d'enviar billing_mode, installments, fixed_installments ni custom_schedule a través d'aquest camí.

from datetime import datetime
from zoneinfo import ZoneInfo

from finanfut_billing_sdk.models import ExternalContractCharge, ExternalContractStartRequest

payload = ExternalContractStartRequest(
    request_id="sports_membership_enrollment_123_v1",
    source_system="sports",
    contract_type="scheduled_charges",
    business_unit_id="bu_sales",
    source_entity_type="membership_enrollment",
    source_entity_id="membership_enrollment_123",
    billing_client_id="client_uuid",
    provider_profile_id="club_42",
    organization_id="org_9",
    club_id="club_42",
    bu_plan_ref="membership_plan:plan_123",
    bu_price_ref="membership_plan_price:price_123",
    currency="EUR",
    total_amount_minor=12000,
    charges=[
        ExternalContractCharge(
            sequence=1,
            amount_minor=4000,
            due_at=datetime(2026, 7, 15, tzinfo=ZoneInfo("Europe/Madrid")),
            external_ref="membership_enrollment_123_charge_1",
        )
    ],
    payment_method_required=True,
    success_url="https://sports.example.test/billing/success",
    cancel_url="https://sports.example.test/billing/cancel",
    metadata={
        "name": "Quota temporada 2026 - Juvenil A",
        "plan_name": "Temporada 2026",
        "organizer_name": "Club Esportiu Exemple",
        "organizer_id": "club_42",
        "category_name": "Juvenil A",
    },
    sports_original_snapshot={"payment_type": "installments", "schedule_mode": "relative"},
    resolved_contract_snapshot={
        "plan_name": "Temporada 2026",
        "organizer_name": "Club Esportiu Exemple",
        "category_name": "Juvenil A",
    },
    economic_classification={
        "economic_flow_type": "club_membership",
        "recognition_role": "THIRD_PARTY_FUNDS",
        "seller_role": "MARKETPLACE_OPERATOR",
        "funds_ownership": "THIRD_PARTY_FUNDS",
        "tax_ownership": "MERCHANT_TAX",
        "ownership_confidence": "explicit",
    },
    economic_owner="club",
    merchant="billing",
    seller="club",
)

response = client.contracts.start_contract(payload, idempotency_key=payload.request_id)

Billing és propietari de targetes, setup checkout, payment checkout, retries, webhooks, invoices, ledger i settlements. Sports pot enviar un payment_method_setup_id creat per Billing, però no ha d'enviar cap stripe_payment_method_id cru. Billing només accepta setups ready; un setup pendent retorna un 409 funcional perquè Sports pugui reintentar després de payment_method.saved.

Per quotes recurrents, Sports ha d'usar el mateix client amb contract_type="recurring":

from datetime import date

from finanfut_billing_sdk.models import ExternalContractStartRequest

payload = ExternalContractStartRequest(
    request_id="sports_membership_enrollment_123_recurring_v1",
    source_system="sports",
    contract_type="recurring",
    business_unit_id="bu_sales",
    source_entity_type="membership_enrollment",
    source_entity_id="membership_enrollment_123",
    billing_client_id="client_uuid",
    bu_plan_ref="membership_plan:plan_123",
    bu_price_ref="membership_plan_price:monthly",
    currency="EUR",
    amount_minor=3000,
    frequency="monthly",
    start_date=date(2026, 9, 1),
    end_date=date(2027, 6, 30),
    billing_day_of_month=1,
    billing_months=[9, 10, 11, 12, 1, 2, 3, 4, 5, 6],
    success_url="https://sports.example.test/success",
    cancel_url="https://sports.example.test/cancel",
    sports_original_snapshot={"payment_type": "recurring"},
    economic_classification={
        "economic_flow_type": "club_membership",
        "recognition_role": "THIRD_PARTY_FUNDS",
        "seller_role": "MARKETPLACE_OPERATOR",
        "funds_ownership": "THIRD_PARTY_FUNDS",
        "tax_ownership": "MERCHANT_TAX",
        "ownership_confidence": "explicit",
    },
    economic_owner="club",
    merchant="billing",
    seller="club",
)

response = client.contracts.start_contract(payload, idempotency_key=payload.request_id)

Sports ha d'enviar start_date com a data efectiva d'alta/activació. Billing no ha de cobrar períodes anteriors a aquesta data; si start_date és futura, el checkout/setup pot passar ara i el primer període facturable comença a start_date.

La resposta és un ExternalContractStartResponse:

assert response.contract_id
assert response.ledger_id

if response.contract_type == "scheduled_charges":
    assert response.schedule_id
    assert response.next_charge_at
    assert response.payment_method_status

Si response.checkout_url és present, Sports ha de redirigir l'usuari. Si no hi ha checkout i payment_method_status=="ready", Billing ja té una targeta operativa.

Operacions de consulta i cancel·lació:

contract = client.contracts.get_contract(response.contract_id)

canceled = client.contracts.cancel_contract(
    response.contract_id,
    reason="sports_contract_replaced",
    idempotency_key=f"{response.contract_id}:cancel:v1",
)

La cancel·lació conserva ítems pagats i només cancel·la ítems pendents. Sports ha de tractar subscription.canceled com la confirmació canònica.

Webhooks que Sports ha de consumir:

• subscription.invoice_paid
• subscription.payment_failed
• subscription.completed
• subscription.canceled

Els payloads de contracte inclouen external_contract_id, contract_type, ledger_id, schedule_id, schedule_sequence, external_ref, billing_transaction_id, amount_total, amount_fee i amount_net. settlement_lines_suggested només apareix quan Billing té commission_breakdown. Sports no ha de calcular nets ni fees a partir del contracte inicial.

Errors habituals:

• pydantic.ValidationError: el payload no compleix els models del SDK.
• FinanfutBillingValidationError: Billing rebutja valors o forma del payload.
• FinanfutBillingServiceError amb status_code == 409: mateix (source_system, request_id) amb payload diferent.
• FinanfutBillingAuthError: API key absent, incorrecta o sense scope.

Errors

from finanfut_billing_sdk.errors import (
    FinanfutBillingAuthError,
    FinanfutBillingServiceError,
    FinanfutBillingValidationError,
)

try:
    client.list_tax_rates()
except FinanfutBillingAuthError:
    print("API key incorrecta o sense permisos")
except FinanfutBillingValidationError as e:
    print("Error de validació:", e.payload)
except FinanfutBillingServiceError as e:
    print(f"Error de servei ({e.request_id}): {e.error}")
    if e.retry_after is not None:
        print(f"Reintenta després de {e.retry_after:.0f}s")

Els errors del backend inclouen sempre error, message i request_id. El client reintenta automàticament errors transitoris (429, 500, 502, 503, 504) en lectures i en mutacions només quan la petició porta Idempotency-Key.

Publicació a PyPI

El paquet està preparat per publicar-se a PyPI quan es creen tags v* al repositori. El workflow publish-sdk.yml valida la versió (__version__) i fa l'upload amb Twine.