Hello, the new version is now available (1.0.8). ACSG is now also available on Game Jolt, and it has a card payment option there. Please let me know if this solves your payment issue. Thanks!
ACSG GameJolt:
https://gamejolt.com/games/ACSG/1019814
1.0.8 Release Article:
https://serpagames.itch.io/acsg/devlog/1036007/version-108-released-changelog
