Function parse_fill_report 

pub fn parse_fill_report(
    fill: &AxFill,
    account_id: AccountId,
    instrument: &InstrumentAny,
    ts_init: UnixNanos,
) -> Result<FillReport>

Parses an Ax fill into a Nautilus [FillReport].

Note: Ax fills don’t include order ID, side, or liquidity information in the fills endpoint response, so we use default values where necessary.

Errors

Returns an error if:

• Price or quantity fields cannot be parsed.
• Fee parsing fails.