[cwalv]

An OTP that's reused?

[labster]

Omni-time password

[csomar]

It solves the problem for 99.99% of the time. Drivers are not going to memorize your OTP; and it is unlikely that an OTP list will be leaked/used anytime soon.

[broken-kebab]

Maybe, but there's OT in OTP. So if it's not changing then it's not OTP, just P.

[travisjungroth]

It changes every time. You can also just have it at night, which I have. Prevents drunk wrong riders.

[wildzzz]

For that driver, it's effectively an OTP although probably not very pseudorandom.

[mrloop]

An MTP

[ctxc]

I mean it _technically_ isn't an OTP, but you know what I mean - just a code only the user knows that they need to share with the rider.

The threat model is sufficiently low to justify the much better UX of not having to look the code up everytime.

[Propelloni]

The acronym you are looking for is "PIN", a Personal Identification Number.