...
- fetch chargeData from MySQL where loanId is null and circRule = thisOrThat
- confirm that the relevant user and item records exist; if not update chargeData set loanId="error"
- POST data to
- /circulation/check-out-by-barcode for fixed due date all loans
- follow up with /circulation/override-check-out-by-barcode /loans/{id}/change-due-date for rolling due date loans
- update chargeData set loanId = the loans UUID