As of now, modifying custom connectors' properties after they have been deployed only have two options:

1. Through the UI, updating the field manually, which allows you to update a single field.
2. Through the REST API, which requires sending all the properties every time. Updating a single property without sending the rest is not allowed.

As custom connectors mask their data in Fivetran's UI, updating non-sensitive data becomes bothersome, and also involves a human in the process, which is not always desired.

For the REST API option, as as of now requires all the properties being informed to update a single property, even if all of them but one are unchanged, it requires sending the credentials every time, even if they didn't change. This can become a problem, as credentials might have been entered using the Collaborator Link functionality, so the automation wouldn't have access to those credentials.

Hence, we are requesting to Fivetran a new REST API functionality for Custom Connectors, where you could update one or more properties without sending all properties every time, just doing a PATCH over the properties that are changed.