Pure-reference catalog of payment lifecycle state machines across Stripe, Adyen, PayPal, and Braintree: canonical states (created / requires_action / processing / succeeded / requires_capture / canceled / failed), authorisation vs capture, asynchronous webhook states, refund / dispute / chargeback transitions, and the 3-D Secure (EMVCo 3DS 2.x) frictionless / challenge flow paths with per-gateway 3DS test cards (references/3ds-flows.md). Use when designing tests for payment flows, auditing state-handling code, or covering a 3DS round-trip; this is the state model, not a builder - to author suites on it use payment-flow-test-author (refunds, disputes, webhook replay).
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The skill is specifically designed for direct financial operations, giving the agent the ability to move money or execute financial transactions — such as payment processing, cryptocurrency operations, banking integrations, or market order execution.
The document is explicitly about payment platform state machines and references specific payment gateway concepts and mutating payment actions: it names providers (Stripe, Adyen, PayPal, Braintree) and describes explicit operations such as manual capture and issuing refunds (i.e., calls that move or reverse money). Because it is specifically about payment APIs and mutating payment operations (authorize/capture/refund), it constitutes direct financial execution capability.