Python SDK for the HostPay payments API
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HostPay Python SDK
A small, typed client for the HostPay payments API — wallets, deposits, transfers, payouts, escrow, transaction queries, user/wallet lifecycle management, and webhook verification.
Install
pip install hostpay # once published
# or, from this repo:
pip install ./sdk/python
Requires Python 3.8+ and httpx.
Quickstart
from hostpay import HostPay
client = HostPay(api_key="ak-...", secret_key="sk-...")
# Test Mode? use your test keys — same code, no real money moves.
# 1. Create a user and their wallet
user = client.users.create(
app_user_id="user_123",
name="Alice",
phone_number="+23279000000",
email="alice@example.com",
)
wallet = client.wallets.create(user.id)
# 2. Deposit via mobile money
deposit = client.deposits.mobile_money(wallet_id=wallet.id, amount=100)
# 3. Check the balance (attribute or dict access)
bal = client.wallets.balance(wallet.id)
print(bal.balance, bal["currency"])
# 4. Transfer, pay out, escrow
client.transfers.create(sender_wallet_id=wallet.id, recipient_identifier="bob", amount=20)
client.payouts.mobile_money(wallet_id=wallet.id, amount=5, phone_number="+23279000000")
hold = client.escrow.hold(wallet_id=wallet.id, amount=10)
client.escrow.release(hold.id, recipient_wallet_id="...")
Authentication
Pass your api-key and secret-key once at construction; they're sent on every
request. base_url defaults to production — point it at your staging host for
testing.
Idempotency
Money-moving calls accept idempotency_key — reuse the same key to safely retry
without double-charging:
client.payouts.mobile_money(
wallet_id=w, amount=5, phone_number="+232...", idempotency_key="order-42-payout"
)
Verifying webhooks
Pass the raw request body and headers straight from your web framework:
from hostpay import HostPay, SignatureVerificationError
client = HostPay(api_key="ak-...", secret_key="sk-...")
# e.g. in Flask
@app.post("/webhooks/hostpay")
def hook():
try:
event = client.webhooks.construct_event(
payload=request.get_data(), # raw bytes, not request.json
headers=request.headers,
secret=WEBHOOK_SIGNING_SECRET,
)
except SignatureVerificationError:
return "", 400
if event.event == "deposit.completed":
...
return "", 200
Signatures are HMAC-SHA256 over "<timestamp>.<body>"; deliveries older than
tolerance seconds (default 300) are rejected.
Errors
All errors derive from HostPayError and carry .status_code and .detail:
AuthenticationError (401/403), InvalidRequestError (400/404/422),
RateLimitError (429), APIError (5xx), APIConnectionError,
SignatureVerificationError.
Sandbox testing
In Test Mode, a user's phone number drives deterministic outcomes (see the
Testing guide): +23299000001
completes, +23299000002 fails, +23299000009 stays pending. The same fail
number works for payout recipients.
Typed responses
Core methods are annotated with TypedDict models (hostpay.models): users.*
return UserRead, wallets.create/get return WalletRead, transfers/
payouts return TransactionResponse, and escrow.* returns EscrowResponse.
A type checker (mypy/Pyright) will autocomplete and check keyed access —
user["id"], wallet["balance"]. Ad-hoc responses (wallet balance, the deposit
envelope) stay loosely typed.
At runtime every response is a HostPayObject (a dict), so both resp["field"]
and resp.field work regardless of typing. The model fields mirror the committed
../openapi.json, the source of truth for both SDKs —
regenerate the spec with python wallet-system/scripts/dump_openapi.py.
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