Wraps Adyen test-mode patterns: test-API-key initialization, the canonical Adyen test cards (Visa 4111 1111 1111 1111; 5454 5454 5454 5454 3DS frictionless; 4917 6100 0000 0000 3DS 2 challenge), the per-flow result codes (Authorised / Refused / Pending / RedirectShopper / Error), the HMAC-SHA256 webhook validation, and notifications-vs-API duality (Adyen separates synchronous API calls from asynchronous notifications). Use when testing Adyen-integrated code.
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