Since you mention COBOL, a lot of work is being done in COBOL to export JSON feeds exactly for this. Since the late 2000s and 2010s back-end core banking space

Since you mention COBOL, a lot of work is being done in COBOL to export JSON feeds exactly for this. Since the late 2000s and 2010s back-end core banking space (in larger banks) was largely about moving from disparate code to a common trunk, this, at least for friends 'lucky' enough to be connected to this, seems to be implemented as a general solution so should XTZ country decide to do their own regulatory implementation of Open Banking/PSD2 a lot of the ground work will have been done.