You're correct, Aristois uses loader-v2. But even if you were to remove the URL (it regenerates because it will check SHA from the URL and replace the file if not matching) from the json and replace the jar here, it will crash because Aristois (weaver) was not updated to support the new Fabric version. It requires us updating the weaver first.
When your transaction is declined by the bank, there's nothing that we can do on our end to fix that. It's an issue that you would need to bring up with your bank.
We support anything Stripe supports (debit/credit, bank transfer, Google Pay, Apple Pay) and crypto.
It's currently not possible, as the 1.18.1 version of OptiFabric will crash with fabric loader 0.12.9 (current Aristois loader). OptiFine will be added to the marketplace when the new loader is supported.