python -m pip install . in its package directory. To integrate directly over HTTPS, follow the HTTP quickstart.
Read a transaction
client.payments.retrieve_by_order_id(order_id) when you have the merchant order reference. The client also lists payments, handles refunds and creates sales, payouts and payment links. Pass amounts as decimal strings. Persist the idempotency key with the order and supply it as idempotency_key on creation. For asyncio, use async with AsyncOrsunPay(...) and await each resource call.