sometimes the eob (explanation of benefits) would eventually show up but it would have no check number to tie it back to the payment. It would also span checks so you really had no way to tie what payment went to what prescription. You just had a pile of money and a pile of billed prescriptions. AR reconciliation, trying to figure out who paid for what and how much you're owed and how old it is, was a dark art and the code had all kind of tweaks for specific payers accommodating for all their payment inconsistencies. Some payers met the terms of the contract, some didn't, some had bugs where they'd over/under pay $1 in certain circumstances etc. It was a mess, i'd tell the payers to fix their system but they'd just blow me off (I was pretty naive at the time). Interestingly, i could tell when multiple payers leased the same system because there would be strange bugs consistent across payers. That $1 over/under payment sticks out in my mind 25 years later.