The Complete Mix & Master Package provides everything you need to distribute your songs. It includes everything in the Mixing order, and the Mastering order.

Free simple project editing
3 revisions included in the price
Each next 3 revisions for $25
2-3 business days turnaround per song, or 1-day Rush Service per song ONLY after files confirmation
Manual Vocal Editing has 10 vocal stems limit.
Five minutes song duration limit

Ensure that the mix down is not clipping, and avoid using normalization, compressor, EQ, or limiter on the master bus (master fader).
Make sure the peaks are not louder than -6db.
Export multitrack session from your DAW.
Submit your demo mix and put reference track for your song, if possible.