Providers

Provider	Checkout	Multi-item	Quantity	Subscriptions	Physical	Portal	Webhooks
Stripe	Session/link	Yes	Yes	Yes	Yes	Yes	Yes
Polar	Session/link	No	No	Yes	No	Yes	Yes
PayPal	Orders/Billing	One-time	Yes	Yes	Yes	No	Yes
Square	Payment Link	Yes	Yes	No*	Yes	No	Yes
Paddle	Transaction	Yes	Yes	Yes	No	Yes	Yes
Lemon Squeezy	Variant checkout	No	No	Yes	No	URL	Yes
Link	Hosted URL	No	No	Delegated	Delegated	No	No
Mock	Simulation	Yes	Yes	Yes	Yes	Simulated	Fixture

* The current Square adapter intentionally does not claim subscription checkout.

This public deployment selects Mock and cannot collect payment. CI runs all eight

provider adapters through the shared contract suite and fixture request tests.

Credential-gated workflows are ready for provider sandboxes, but skip cleanly

when repository secrets are absent. Link proves the completely static path.