Epoint Python SDK

Payments are the one place where a retry can cost real money, so the client is built around one rule: never charge twice.

• Checkout, status, refunds, saved cards and widgets — every Epoint endpoint, sync and async.
• Signed callbacks — verify_callback checks the signature; the redirect alone is never trusted.
• Apple Pay and Google Pay through the Epoint widget.
• Double-charge-safe retries — a refused connection is retried; a timeout or 5xx on a call that moves money is not retried and raises OutcomeUnknownError with the order id; reads retry with backoff.
• Declined cards return a failed Transaction instead of raising.

The idea is the same as the DNS SDKs: small, typed, and honest about what happened on the wire.