Dispatch sheet
A dispatch sheet names the carrier assigned to your car, its MC or USDOT number, and the rate. You should have it before pickup. A text that says the driver is on the way is not a substitute for those three facts.
A dispatch sheet is the record that a specific carrier took your load. Ask for the carrier's legal name, its MC or USDOT number, a driver name and phone, the pickup window, and the amount the carrier is being paid or the amount you still owe. Companies use different layouts. The facts matter more than the title at the top.
How to check it
Look up the number yourself on SAFER or the FMCSA Licensing and Insurance search. The legal name on the federal record should match the name on the sheet. A screenshot the broker texts you can be old, cropped, or someone else's company. Check on the day of pickup, not the day you booked.
How it differs from a text message
A text can be the first alert. It is not the assignment if it lacks the carrier's docket and the rate. "Driver will be there today" does not name who has your car. If the person who arrives is a different company, stop and read the substitution clause before you hand over the keys. RideShipper does not issue dispatch sheets.