[mothered]

idk what OTP means

It's an abbreviation of "One-Time Password", which Is sent to your email address or cell phone.

When the driver arrives, you must tell/show him the password to accept the package. If you refuse to do so, he has every right to mark It as an undelivered consignment.

perfect, never did that in my life

If you hit Amazon quite often, you'll find that an OTP will be requested with certain Items.