Block field update from a particular vendor vs a particular type

Create a temporary field for job title and tell the vendor to write to that field

Create a smart campaign to update Job title from temporary field if job title is empty

Pretty sure this has been asked + answered before... no, it's not possible using direct connections to the Marketo API. If you can steer that vendor's calls through an API gateway however, it's certainly possible.

(An APIGW is a reverse proxy that allows for granular manipulation and mapping of requests, including blocking specific fields.)

You might already know this but you can set API roles which have access to do certain things, but not others.

But I'm guessing if you want access to write to some fields, but not others, that can't be done. It's as granular as the API endpoints, basically - so "read/write" on fields would give access to all fields (except those blocked by field updates, but then that is done for ALL API users unfortunately).

If you didn't want them to touch ANY fields then roles might be a solution though.