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If going from scratch, trying to get support from an acquiring bank to verify authorisation and settlement integration as a community project would be “interesting”. Things like PCI compliance, 3DS accreditation etc. also. Pretty much need to piggyback off an existing solution.
not only do these people want to do fascism, they want you to rawdog it
Edit: having read this back to myself, I realise that the alternative of non-rawdogged fascism would be much more unlikely