Every bounce log entry on the account, one per bounced message with its timestamp, bounce code, contact and campaign. Filter to one contact with filters[subscriberid]. filters[tstamp] matches one exact timestamp, not a range, so there is no way to count bounces for a date range in one request; to bound by time, sort with orders[tstamp] and page until the entries pass the boundary. meta.total is the number of matching entries. Unknown filter keys are ignored rather than rejected, so the response can look filtered when it is not, and an operator on a known key such as filters[tstamp][gt] is applied as an exact match with that value, not as a range. 20 entries per request by default and at most 100; page with offset.