決済効果音パック

Integrate my selected SFXMint MP3 files into the matching events in this project. Use the existing audio system and preserve the current behavior.

Selected event-to-file mapping:
add_to_cart: https://sfxmint.com/dl/ui-pop-61.mp3
  File metadata: https://sfxmint.com/api/v1/sounds/ui-pop-61
purchase: https://sfxmint.com/dl/office-cash-register-05.mp3
  File metadata: https://sfxmint.com/api/v1/sounds/office-cash-register-05
success: https://sfxmint.com/dl/feedback-success-56.mp3
  File metadata: https://sfxmint.com/api/v1/sounds/feedback-success-56
error: https://sfxmint.com/dl/feedback-error-34.mp3
  File metadata: https://sfxmint.com/api/v1/sounds/feedback-error-34
countdown: https://sfxmint.com/dl/mechanical-clock-tick-49.mp3
  File metadata: https://sfxmint.com/api/v1/sounds/mechanical-clock-tick-49
reward: https://sfxmint.com/dl/retro-game-coin-52.mp3
  File metadata: https://sfxmint.com/api/v1/sounds/retro-game-coin-52

Download these exact selections locally and keep the mapping, source URLs, CC0-1.0 license and available format metadata. Check HTTP responses before saving: if a file is unavailable, report it rather than saving an error response as audio or silently substituting another file. Set metadata at https://sfxmint.com/api/v1/sets/checkout?format=mp3 describes defaults, which may differ from my choices above.

Connect playback to each matching event; report events that do not exist in this project. Respect audio unlock and existing mute/volume controls. Verify playback and local-file loading, then let me preview the result. Report missing files and any listening checks still needed; file metadata alone is not listening approval. Preserve originals and document any permitted processing. Do not replace these selections or call paid generation services without my authorization.