Retorna Gateway SDK for Python

Official Python SDK for Retorna Gateway (the Retorna B2B API): quotations, orders, wallets and delivery routes. Successor of retorna-python-sdk 1.x; an idiomatic port of the Retorna Gateway SDK for Java, speaking the same contract. The import name is retorna_sdk.

Built in: OAuth2 client_credentials authentication, automatic token refresh, RSA request signing, retries with exponential backoff, explicit idempotency keys, and full type hints.

One runtime dependency — cryptography, because RSA signing is not in the standard library. HTTP is urllib, models are dataclasses, JSON is json. Nothing else lands in your dependency tree.

Highlights vs v1

• Authentication is two independent proofs: an OAuth2 bearer token AND an RSA signature on every request. A valid token on its own is a 401.
• /me/* endpoints are token-scoped — one credential pair = one company. No more owner_id parameter.
• Monetary amounts are decimal strings ("56.00", "100.000001"), never float. The SDK keeps them as str end to end.
• Wallet transactions moved from offset to cursor pagination. Sending page is now a 400.

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Requirements

• Python 3.9 or higher.
• Retorna-issued client_id, client_secret, and an RSA private key in PKCS#8 PEM form.

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Installation

pip install retorna-gateway-sdk

uv add retorna-gateway-sdk

poetry add retorna-gateway-sdk

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Quickstart

The full example lives at examples/quickstart/quickstart.py.

import os
from retorna_sdk import (
    RetornaClient, CreateQuotationRequest, QuotationSource, QuotationDestination,
    QuotationPayoutMethod, QuotationQuote, PayoutMethodType, QuoteMode,
)

client = RetornaClient.create(
    environment="DEVELOP",
    client_id=os.environ["RETORNA_CLIENT_ID"],
    client_secret=os.environ["RETORNA_CLIENT_SECRET"],
    private_key=os.environ["RETORNA_PRIVATE_KEY"],  # signs every request
)

# 1. Balance (token-scoped — no company id anywhere)
wallet = client.get_my_wallet("USDR")
print(wallet.amount, wallet.currency)

# 2. Available corridors
routes = client.get_routes("USDR")

# 3. Lock a rate
quote = client.create_quotation(CreateQuotationRequest(
    source=QuotationSource("USDR"),
    destination=QuotationDestination(
        country="VE", currency="VES",
        payout_method=QuotationPayoutMethod(PayoutMethodType.BANK_TRANSFER),
    ),
    quote=QuotationQuote(QuoteMode.SEND_EXACT, "10.00"),
))
print(quote.exchange_rate.value, quote.target.amount)

Two ways to build a client

RetornaClient.create(...) is the Python front door. The fluent builder mirrors the Java SDK and is there when you need to inspect or reuse a config:

from retorna_sdk import RetornaClientBuilder, RetornaEnvironment

client = (
    RetornaClientBuilder()
    .environment(RetornaEnvironment.DEVELOP)
    .client_id(...).client_secret(...).private_key(...)
    .retries(3).backoff_ms(200)
    .logging_level("DEBUG")
    .build_client()
)

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Three things that will bite you

1. The private key is not optional

b2b-service runs a global signature guard. Every api-channel request carries signature and nonce headers, checked against your tenant's public key independently of the bearer token. A perfectly valid token with no signature gets a 401.

The key must be PKCS#8 (-----BEGIN PRIVATE KEY-----). If yours starts with BEGIN RSA PRIVATE KEY it is PKCS#1:

openssl pkcs8 -topk8 -nocrypt -in key.pem -out key-pkcs8.pem

The SDK accepts the PEM with real newlines, with \n escapes, or flattened onto one line with spaces — which is the shape AWS Secrets Manager hands back.

2. Money is a string

wallet.amount          # "1234.567890"  <- str, always
float(wallet.amount)   # DON'T. IEEE-754 cannot represent 0.1.

When you need arithmetic, go through Decimal:

from retorna_sdk.core import money

total = money.parse(wallet.amount) + money.parse("10.50")
amount_for_the_wire = money.format(total)   # back to str

3. Every 401 looks the same

Bad credentials, an expired token, and a bad request signature all surface as a bare 401 B2B_UNAUTHORIZED. The guard never says which check failed. When you are debugging one, that ambiguity is the problem — start by confirming the key matches the client_id.

The SDK will not retry a 401 when it holds a token it believes is still fresh, precisely because that case means credentials or signature, not staleness.

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Error handling

Three exception types, all subclasses of RetornaError:

from retorna_sdk import RetornaB2BError, RetornaAuthError, RetornaSdkError

try:
    order = client.create_order(request, idempotency_key="invoice-42")
except RetornaB2BError as e:
    # The API understood the request and refused it.
    e.code            # "B2B_INSUFFICIENT_BALANCE" (raw wire string, always preserved)
    e.code_enum       # B2BErrorCode.B2B_INSUFFICIENT_BALANCE
    e.category        # B2BErrorCategory.PERMANENT
    e.http_status     # 422
    e.correlation_id  # what support will ask you for
    e.is_retryable    # only TRANSIENT errors are
except RetornaAuthError as e:
    # Token endpoint rejection, or the API rejecting the token/signature.
    e.http_status
except RetornaSdkError as e:
    # Transport, JSON, or an unstructured 5xx.
    e.context         # "OrdersClient.create_order"
    e.cause

An error code the SDK does not know about still arrives as a RetornaB2BError with code intact and code_enum == B2B_UNKNOWN, so a new backend code never breaks a deployed integration.

Bad arguments raise plain ValueError instead, because a malformed UUID is your bug, caught before anything reaches the network.

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Idempotency

POST /orders requires an X-Idempotency-Key. It is free-form — the backend only checks that it is present, not that it is a UUID. It round-trips as the order's external_id and is a list filter, so your own invoice number is the intended value:

order = client.create_order(request, idempotency_key="INV-2026-0042")
...
found = client.list_orders(ListOrdersParams.by_external_id("INV-2026-0042"))

Reuse the same key when retrying and the server deduplicates instead of paying twice. Pass nothing and the SDK generates a UUID — safe, but you lose the ability to correlate a retry.

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Pagination

Cursor-based, for both orders and wallet transactions:

from retorna_sdk import ListOrdersParams

cursor = None
while True:
    page = client.list_orders(ListOrdersParams(cursor=cursor, limit=100))
    for order in page.data or []:
        ...
    if not page.pagination.has_more:
        break
    cursor = page.pagination.next_cursor

pagination.total is the count matching your filters, not the page size, and it may be None.

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API surface

Operation	Method	Endpoint
Create quotation	create_quotation(request)	POST /quotations
Get quotation	get_quotation(id)	GET /quotations/{id}
Create order	create_order(request, idempotency_key)	POST /orders
Get order	get_order(id)	GET /orders/{id}
List orders	list_orders(params)	GET /orders
Get routes	get_routes(source_currency)	GET /me/routes
Get company	get_my_client()	GET /me/client
Get wallet	get_my_wallet(currency)	GET /me/wallets/{currency}
Wallet transactions	get_my_wallet_transactions(currency, type, params)	GET /me/wallets/{currency}/transactions/{type}

Each is also reachable through its sub-client: client.orders.create_order(...), client.wallets.get_my_wallet(...), and so on.

Resource ids are opaque strings of 1..100 characters. Do not assume they are UUIDs — dev returns UUID-shaped ids today, the orders spec documents cpg_txn_a1b2c3d4e5f6, and both are within contract.

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Configuration

Option	Default	Notes
environment	PRODUCTION	DEVELOP, SANDBOX, PRODUCTION
retries	3	Retried on 429 and 5xx only
backoff_ms	200	Exponential: backoff_ms * 2**attempt
connect_timeout	10.0	Seconds
request_timeout	10.0	Seconds
logging_level	ERROR	NONE, ERROR, WARN, INFO, DEBUG — writes to stderr
ssl_context	None	For mutual TLS; see retorna_sdk.core.tls
base_url_override / auth_url_override	None	https only

Environments resolve to:

Environment	Base URL	Scope
DEVELOP	https://api.gateway.dev.retorna.app	sandbox/full_access
SANDBOX	https://api.gateway.sandbox.retorna.app	sandbox/full_access
PRODUCTION	https://api.gateway.retorna.app	prod/full_access

SANDBOX is the environment the public API documentation calls Sandbox; infra names the same stack stg, which is why its Cognito hosted domain says b2b-retorna-stg.

Identity headers

Every request carries two headers that tell the platform which SDK is calling, so adoption per version can be tracked and support can tell a Python integration from a Java one:

X-Retorna-Client: python-sdk/1.0.0
User-Agent: python-sdk/1.0.0 (python/3.12.4; Linux x86_64)

The python-sdk token is fixed and independent of the PyPI distribution name. Nothing sensitive is sent.

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Development

python -m venv .venv && source .venv/bin/activate
pip install -e ".[dev]"

make test          # unit tests
make lint          # ruff
make typecheck     # mypy --strict
make check         # all three
make integration   # live DEVELOP tests (needs credentials)

The integration suite is read-only by design — it never calls create_order, which moves real funds. Keep it that way.

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Relationship to the other SDKs

This SDK is a port of the Retorna Gateway SDK for Java (retorna-java-sdk-v2), the reference implementation. The request-signing logic is verified byte-for-byte against it. All three SDKs (retorna-gateway-sdk on npm, Maven Central and PyPI) share the same contract, the same environment names and the same X-Retorna-Client identity header.

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License

Proprietary. Use is limited to integrating your systems with Retorna Gateway under a commercial agreement with Retorna — see LICENSE.