Build an Idempotent Order API with Python and SQLite
Build a Python order API that survives a lost response and concurrent retries. Run the SQLite example, inspect saved orders and test conflicting keys.
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Is a Valid Payment Webhook Signature Enough to Fulfill an Order?
Check payment webhook signatures, order binding and current refund state before fulfillment, with a small exercise and a merchant acceptance worksheet.
Where to Enforce Spending Limits for AI Agents
Review API and Guard spending checks, raw token units, UTC budget windows and concurrent requests using Agent Wallet Guard local source.
Partial Refunds and Digital Product Entitlements
Separate refund amounts from download access decisions, with a source-based look at StableIn fulfillment and a scoped entitlement extension.
Validate Stablecoin Checkout Amounts on the Server
Review server-owned stablecoin prices, raw integer amounts, asset identity and order expiry using the current StableIn local merchant example.
Mapping Payment Provider Events to Order States
Preserve raw provider events and map them to explicit order decisions. Includes a worksheet for duplicates, unknown statuses, refunds and reconciliation.