commerce
the careful cashier
money and access are separate facts. a provider redirect is an intent; a verified, idempotently recorded provider event is the authority to fulfill.
idempotent to the centwebhooks are the truthevery state reconciled
Payment acceptance, subscriptions, payment webhooks, QR payments, merchant-of-record choices, licensing, and Shopify apps, extensions, themes, and billing.
methodology
- identify the authority: payment provider, Shopify, or both; then read the matching guide.
- choose a provider from product, country, tax, marketplace, payout, and licensing requirements; do not infer fit from a price table.
- preserve the raw webhook body, verify its provider signature, deduplicate by provider event ID, and make fulfillment retry-safe.
- prove local handling separately from provider sandbox, authenticated dashboard, and production payment evidence.
contents
- trainedlearned defaults and evidence boundary
- payment-integrationproviders, checkout, subscriptions, QR, webhooks, licensing
- shopifyShopify app, extension, theme, Admin API, or Shopify billing