Type each acquirer's month from its statement: the number of transactions, the volume, and what it charged for the high-risk program. Tariff works out what the program should have cost at that acquirer's rates. The month closes when every acquirer is in, every gap is explained, and no reassessment is overdue.
Each acquirer that registers the merchant in the program charges its own registration fee and applies its own per-transaction and volume charges. Adult content is the highest tier, reassessed every year.