I am a really young beginner here to using anything related to an API.
I am desperate to figure out how to use json to read an opportunity’s custom field as well as update an opportunity’s custom field.
I am trying to build a custom Zapier connection to do this and I am not having any luck understanding how to do this at all.
From what I can tell there is not a way to do this with the REST API. Which is a bummer as I have a custom zap that can find an opportunity and then update it. But, there is not way to read or update any custom fields with the same method.
I have looked over the legacy XML API and this looks possible somehow but I have not idea how to do this. Any help would be VERY appreciated.