SCAMMER: This is at least a VIN Report Scammer, when you are selling a car they will reach out, offer next day cash, and require you to provide a vehicle history report from their specific website, the reports cost between 28-130 and they get your card info, phone, email. Note there are credible data providers to get a vehicle history report, and a lot of free/public resources to get the same info. They will resort to bullying and text into the night, and try to convince you to stop talking to other potential buyers.
FTC Scam Warning: https://consumer.ftc.gov/consumer-alerts/2018/10/steering-clear-vehicle-history-report-scams